はじめて質問させていただきます。

現在、EC-CUBE3.0.10でプラグインを開発しています。
管理画面のオーナーズストア → プラグイン → プラグイン一覧 の画面から、
現在開発中のプラグインの「削除」のリンクをクリックした際、
下記のFatalErrorExceptionが発生します。

※一部伏字としています。
※/ec-cube/app/Plugin/【PLUGIN】/Entity/【PLUGIN】Config.phpは存在しています。
----------------------------
Whoops, looks like something went wrong.
1/1 FatalErrorException in DebugClassLoader.php line 150: Compile Error: Symfony\Component\Debug\DebugClassLoader::loadClass(): Failed opening required '/ec-cube/app/Plugin/【PLUGIN】/Entity/【PLUGIN】Config.php' (include_path='/ec-cube/vendor/phing/phing/classes:.:/usr/share/pear:/usr/share/php')

in DebugClassLoader.php line 150
at DebugClassLoader->loadClass() in RuntimeReflectionService.php line 40
at spl_autoload_call() in RuntimeReflectionService.php line 40
at class_exists() in RuntimeReflectionService.php line 40
at RuntimeReflectionService->getParentClasses() in AbstractClassMetadataFactory.php line 281
at AbstractClassMetadataFactory->getParentClasses() in AbstractClassMetadataFactory.php line 311
at AbstractClassMetadataFactory->loadMetadata() in AbstractClassMetadataFactory.php line 216
at AbstractClassMetadataFactory->getMetadataFor() in EntityManager.php line 265
at EntityManager->getClassMetadata() in DefaultRepositoryFactory.php line 67
at DefaultRepositoryFactory->createRepository() in DefaultRepositoryFactory.php line 50
at DefaultRepositoryFactory->getRepository() in EntityManager.php line 665
at EntityManager->getRepository() in 【PLUGIN】ServiceProvider.php line 60
at 【PLUGIN】ServiceProvider->Plugin\【PLUGIN】\ServiceProvider\{closure}() in Pimple.php line 126
at Application::{closure:/ec-cube/vendor/pimple/pimple/lib/Pimple.php:122-130}() in Pimple.php line 83
at Pimple->offsetGet() in EventDispatcher.php line 342
at 【PLUGIN】Plugin->onRenderAdminResponse() in EventDispatcher.php line 158
at call_user_func:{/ec-cube/vendor/symfony/event-dispatcher/EventDispatcher.php:158}() in EventDispatcher.php line 158
at EventDispatcher->doDispatch() in EventDispatcher.php line 46
at EventDispatcher->dispatch() in Application.php line 743
at Application->Eccube\{closure}() in WrappedListener.php line 61
at call_user_func:{/ec-cube/vendor/symfony/event-dispatcher/Debug/WrappedListener.php:61}() in WrappedListener.php line 61
at WrappedListener->__invoke() in EventDispatcher.php line 158
at call_user_func:{/ec-cube/vendor/symfony/event-dispatcher/EventDispatcher.php:158}() in EventDispatcher.php line 158
at EventDispatcher->doDispatch() in EventDispatcher.php line 46
at EventDispatcher->dispatch() in TraceableEventDispatcher.php line 124
at TraceableEventDispatcher->dispatch() in HttpKernel.php line 179
at HttpKernel->filterResponse() in HttpKernel.php line 161
at HttpKernel->handleRaw() in HttpKernel.php line 62
at HttpKernel->handle() in Application.php line 586
at Application->handle() in Application.php line 563
at Application->run() in index_dev.php line 101
at {main}() in index_dev.php line 0
----------------------------

event.ymlにこちらの定義を行っていると発生するようですが、何か対応策はありませんでしょうか。
----------------------------
eccube.event.admin.response:
- [onRenderAdminResponse, NORMAL]
----------------------------

※管理画面ヘッダーの紺色の帯内にhtmlを挿入したく、このフックポイントを利用しています。

よろしくお願いいたします。