Добрый день! При нажатии на кнопку получения правильного результата - ошибка IDE. Переустановлена IDE (Community 2021.3), плагин, проект скачан заново, без изменений. Стактрейс: java.lang.NoClassDefFoundError: com/intellij/openapi/vfs/ex/dummy/DummyFileIdGenerator at com.homework.plugin.vf.HWVirtualFileImpl.<init>(HWVirtualFileImpl.java:15) at com.homework.plugin.vf.HWVirtualFileDirectoryImpl.<init>(HWVirtualFileDirectoryImpl.java:16) at com.homework.plugin.vf.HWDummyFileSystem.createRoot(HWDummyFileSystem.java:60) at com.homework.plugin.vf.HWDummyFileSystem.getInstance(HWDummyFileSystem.java:40) at com.homework.plugin.button.CorrectSolutionButton$ShowDiffAction.run(CorrectSolutionButton.java:110) at com.intellij.openapi.application.impl.ApplicationImpl.runWriteAction(ApplicationImpl.java:947) at com.homework.plugin.button.CorrectSolutionButton.actionPerformed(CorrectSolutionButton.java:86) at com.intellij.openapi.actionSystem.impl.ActionButton.actionPerformed(ActionButton.java:172) at com.intellij.openapi.actionSystem.impl.ActionButton.lambda$performAction$0(ActionButton.java:151) at com.intellij.openapi.actionSystem.ex.ActionUtil.performDumbAwareWithCallbacks(ActionUtil.java:265) at com.intellij.openapi.actionSystem.impl.ActionButton.performAction(ActionButton.java:151) at com.intellij.openapi.actionSystem.impl.ActionButton.processMouseEvent(ActionButton.java:433) at java.desktop/java.awt.Component.processEvent(Component.java:6419) at java.desktop/java.awt.Container.processEvent(Container.java:2263) at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:5029) at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2321) at java.desktop/java.awt.Component.dispatchEvent(Component.java:4861) at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4918) at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4547) at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4488) at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2307) at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2790) at java.desktop/java.awt.Component.dispatchEvent(Component.java:4861) at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:778) at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:727) at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721) at java.base/java.security.AccessController.doPrivileged(Native Method) at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85) at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95) at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:751) at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:749) at java.base/java.security.AccessController.doPrivileged(Native Method) at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85) at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:748) at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:891) at com.intellij.ide.IdeEventQueue.dispatchMouseEvent(IdeEventQueue.java:820) at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:757) at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$6(IdeEventQueue.java:447) at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:818) at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$7(IdeEventQueue.java:446) at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:805) at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:498) at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203) at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124) at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113) at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109) at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90) Caused by: java.lang.ClassNotFoundException: com.intellij.openapi.vfs.ex.dummy.DummyFileIdGenerator PluginClassLoader(plugin=PluginDescriptor(name=JavaRush HomeWork, id=com.javarush.plugin2, descriptorPath=plugin.xml, path=~\AppData\Roaming\JetBrains\IdeaIC2021.3\plugins\JavaRushIdeaPlugin.jar, version=3.54, package=null, isBundled=false), packagePrefix=null, instanceId=48, state=active) at com.intellij.ide.plugins.cl.PluginClassLoader.loadClass(PluginClassLoader.java:235) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522) ... 48 more