Ao tentar gerar Uma apk assinada ele apresenta esse erro:
Information:Gradle tasks [:app:assembleRelease] Warning:butterknife.internal.ButterKnifeProcessor: can't find superclass or interface javax.annotation.processing.AbstractProcessor Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.annotation.processing.AbstractProcessor Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.annotation.processing.ProcessingEnvironment Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.annotation.processing.Filer Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.tools.JavaFileObject Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.annotation.processing.RoundEnvironment Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Modifier Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.ElementKind Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.type.TypeMirror Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.type.TypeKind Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.type.TypeVariable Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.type.TypeMirror Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.type.ArrayType Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.type.DeclaredType Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.type.TypeMirror Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.type.TypeKind Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.util.Types Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.ExecutableElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.ElementKind Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.ExecutableElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.ExecutableElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.VariableElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.type.DeclaredType Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.ElementKind Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.type.TypeKind Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.type.TypeKind Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.SourceVersion Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced field 'javax.annotation.processing.ProcessingEnvironment processingEnv' in program class butterknife.internal.ButterKnifeProcessor Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.annotation.processing.ProcessingEnvironment Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.tools.Diagnostic$ Kind Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.annotation.processing.Messager Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.util.Elements Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.PackageElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.AnnotationMirror Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.annotation.processing.AbstractProcessor Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.annotation.processing.RoundEnvironment Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.type.TypeMirror Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.type.DeclaredType Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.ExecutableElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.VariableElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.annotation.processing.ProcessingEnvironment Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.annotation.processing.Filer Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.tools.JavaFileObject Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.annotation.processing.RoundEnvironment Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Modifier Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.ElementKind Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.type.TypeKind Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.util.Types Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.SourceVersion Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.tools.Diagnostic$ Kind Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.annotation.processing.Messager Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.util.Elements Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.PackageElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.tools.Diagnostic Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.util.Elements Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.util.Types Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.annotation.processing.Filer Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.annotation.processing.ProcessingEnvironment Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.annotation.processing.RoundEnvironment Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.tools.JavaFileObject Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.annotation.processing.RoundEnvironment Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.annotation.processing.RoundEnvironment Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.annotation.processing.RoundEnvironment Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.annotation.processing.RoundEnvironment Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Modifier Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.type.TypeMirror Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.type.TypeVariable Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.type.TypeMirror Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.type.ArrayType Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.type.DeclaredType Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.type.TypeVariable Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.type.TypeMirror Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.type.TypeMirror Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.type.TypeMirror Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.type.TypeMirror Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.annotation.processing.RoundEnvironment Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.annotation.processing.RoundEnvironment Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.annotation.processing.RoundEnvironment Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.type.TypeVariable Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.VariableElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.type.TypeMirror Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.ExecutableElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.type.TypeMirror Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.VariableElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.type.TypeMirror Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.type.DeclaredType Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.type.TypeMirror Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.type.TypeMirror Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.SourceVersion Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.TypeElement Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.AnnotationMirror Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced class javax.lang.model.element.Element Warning:okio.DeflaterSink: can't find referenced class org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement Warning:okio.Okio: can't find referenced class java.nio.file.Files Warning:okio.Okio: can't find referenced class java.nio.file.Path Warning:okio.Okio: can't find referenced class java.nio.file.OpenOption Warning:okio.Okio: can't find referenced class java.nio.file.Path Warning:okio.Okio: can't find referenced class java.nio.file.OpenOption Warning:okio.Okio: can't find referenced class org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement Warning:okio.Okio: can't find referenced class java.nio.file.Path Warning:okio.Okio: can't find referenced class java.nio.file.OpenOption Warning:okio.Okio: can't find referenced class java.nio.file.Path Warning:okio.Okio: can't find referenced class java.nio.file.OpenOption Warning:okio.Okio: can't find referenced class org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement Warning:there were 252 unresolved references to classes or interfaces. Warning:there were 1 unresolved references to program class members. Warning:Exception while processing task java.io.IOException: Please correct the above warnings first. Error:Execution failed for task ':app:transformClassesAndResourcesWithProguardForRelease'. > java.io.IOException: Please correct the above warnings first. Information:BUILD FAILED Information:Total time: 10.397 secs Information:1 error Information:188 warnings Information:See complete output in console 
