I am getting this exception and can’t figure out why…

[2018-01-26 12:25:19] main.CRITICAL: RuntimeException: Source class "" for "Magento\Framework\App\Response\Http\Interceptor" generation does not exist. in /domains/domain.co.uk/http/vendor/magento/framework/Code/Generator.php:185 Stack trace: #0 /domains/domain.co.uk/http/vendor/magento/framework/Code/Generator.php(112): Magento\Framework\Code\Generator->tryToLoadSourceClass('Magento\Framewo...', Object(Magento\Framework\Interception\Code\Generator\Interceptor)) #1 /domains/domain.co.uk/http/vendor/magento/framework/Code/Generator/Autoloader.php(35): Magento\Framework\Code\Generator->generateClass('Magento\Framewo...') #2 [internal function]: Magento\Framework\Code\Generator\Autoloader->load('Magento\Framewo...') #3 /domains/domain.co.uk/http/vendor/magento/framework/ObjectManager/Factory/AbstractFactory.php(93): spl_autoload_call('Magento\Framewo...') #4 /domains/domain.co.uk/http/vendor/magento/framework/ObjectManager/Factory/Compiled.php(88): Magento\Framework\ObjectManager\Factory\AbstractFactory->createObject('Magento\Framewo...', Array) #5 /domains/domain.co.uk/http/vendor/magento/framework/ObjectManager/Factory/Compiled.php(130): Magento\Framework\ObjectManager\Factory\Compiled->create('Magento\Framewo...') #6 /domains/domain.co.uk/http/vendor/magento/framework/ObjectManager/Factory/Compiled.php(67): Magento\Framework\ObjectManager\Factory\Compiled->get('Magento\Framewo...') #7 /domains/domain.co.uk/http/vendor/magento/framework/ObjectManager/ObjectManager.php(57): Magento\Framework\ObjectManager\Factory\Compiled->create('Magento\Framewo...', Array) #8 /domains/domain.co.uk/http/vendor/magento/framework/App/Bootstrap.php(233): Magento\Framework\ObjectManager\ObjectManager->create('Magento\Framewo...', Array) #9 /domains/domain.co.uk/http/pub/index.php(36): Magento\Framework\App\Bootstrap->createApplication('Magento\Framewo...') #10 {main} [] [] 

I’m running Magemtn ver. 2.1.8