I try to install on my lollipop device AppRTCMobile example containing on official repo.

i find a first little error on grandle.build file (not closing “}”).Actually I obtain these error on my log file:

WARN - ect.sync.idea.ProjectSetUpTask - Could not get unknown property           'vectorDrawables' for source set default config of type com.android.build.gradle.internal.api.DefaultAndroidSourceSet.  Consult IDE log for more details (Help | Show Log)  2018-02-13 13:07:01,478 [d thread 6]   INFO - e.project.sync.GradleSyncState - Gradle sync failed: Could not get unknown  property 'vectorDrawables' for source set default config of type com.android.build.gradle.internal.api.DefaultAndroidSourceSet. 

my build.grandle result these:

// Generated by //build/android/generate_gradle.py  buildscript {     repositories {         jcenter()         maven {             url 'https://maven.google.com'         }     }     dependencies {         classpath "com.android.tools.build:gradle:3.1.0-alpha08"     } } 

and my example AppRTCMobile build.grandle result these:

// Generated by //build/android/generate_gradle.py  apply plugin: "com.android.application"  android {     compileSdkVersion "android-27"     buildToolsVersion "27.0.1"  compileOptions {     sourceCompatibility JavaVersion.VERSION_1_8     targetCompatibility JavaVersion.VERSION_1_8 }  sourceSets {     main {         aidl.srcDirs = []         assets.srcDirs = []         java.srcDirs = []         jni.srcDirs = []         renderscript.srcDirs = []         res.srcDirs = []         resources.srcDirs = []     }     test {         aidl.srcDirs = []         assets.srcDirs = []         java.srcDirs = []         jni.srcDirs = []         renderscript.srcDirs = []         res.srcDirs = []         resources.srcDirs = []     }     androidTest {         aidl.srcDirs = []         assets.srcDirs = []         java.srcDirs = []         jni.srcDirs = []         renderscript.srcDirs = []         res.srcDirs = []         resources.srcDirs = []     }     debug {         aidl.srcDirs = []         assets.srcDirs = []         java.srcDirs = []         jni.srcDirs = []         renderscript.srcDirs = []         res.srcDirs = []         resources.srcDirs = []     }     release {         aidl.srcDirs = []         assets.srcDirs = []         java.srcDirs = []         jni.srcDirs = []         renderscript.srcDirs = []         res.srcDirs = []         resources.srcDirs = []     }      main {         manifest.srcFile "../../../../../examples/androidapp/AndroidManifest.xml"         java.srcDirs = [             "extracted-srcjars",         ]         java.filter.exclude(         )         jniLibs.srcDirs = [             "symlinked-libs",         ]         res.srcDirs = [             "extracted-res",         ]     }         defaultConfig {         vectorDrawables.useSupportLibrary = true     } }   dependencies {     implementation project(path: ":examples.AppRTCMobile_javalib")     implementation project(path: ":rtc_base.base_java")     implementation project(path: ":base.base_java")    } afterEvaluate {     def tasksToDisable = tasks.findAll {         return (it.name.equals('generateDebugSources')  // causes unwanted AndroidManifest.java                 || it.name.equals('generateReleaseSources')                 || it.name.endsWith('BuildConfig')  // causes unwanted BuildConfig.java                 || it.name.equals('preDebugAndroidTestBuild')                 || it.name.endsWith('Aidl')                 || it.name.endsWith('Renderscript')                 || it.name.endsWith('Shaders'))     }     tasksToDisable.each { Task task ->       task.enabled = false     } } 

Why I got these error? My buld.grandle on AppRTCMobile is wrong or contain some error??

regards bkt