title: Intellij 2021.1 - Sencha ExtJS plugin not working
body: <p>With the new Intelij version 2021.1 the Sencha ExtJS plugin stops working again. Do you have an idea if or how we could fix this? The bug in the last version could be fixed through deleting some .jar files from the plugin folder.</p>
  <pre><code>    com.intellij.ide.plugins.StartupAbortedException: Fatal error initializing plugin com.sencha.idea.IdeaPlugin
      at com.intellij.serviceContainer.ComponentManagerImplKt.handleComponentError(ComponentManagerImpl.kt:1075)
      at com.intellij.util.indexing.FileBasedIndexDataInitialization.lambda$initAssociatedDataForExtensions$0(FileBasedIndexDataInitialization.java:88)
      at com.intellij.util.indexing.IndexDataInitializer.executeTask(IndexDataInitializer.kt:75)
      at com.intellij.util.indexing.IndexDataInitializer.access$executeTask(IndexDataInitializer.kt:15)
      at com.intellij.util.indexing.IndexDataInitializer$runParallelTasks$$inlined$map$lambda$1.run(IndexDataInitializer.kt:49)
      at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
      at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
      at com.intellij.util.concurrency.BoundedTaskExecutor.doRun(BoundedTaskExecutor.java:216)
      at com.intellij.util.concurrency.BoundedTaskExecutor.access$200(BoundedTaskExecutor.java:27)
      at com.intellij.util.concurrency.BoundedTaskExecutor$1.execute(BoundedTaskExecutor.java:195)
      at com.intellij.util.ConcurrencyUtil.runUnderThreadName(ConcurrencyUtil.java:213)
      at com.intellij.util.concurrency.BoundedTaskExecutor$1.run(BoundedTaskExecutor.java:184)
      at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
      at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
      at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:668)
      at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:665)
      at java.base/java.security.AccessController.doPrivileged(Native Method)
      at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1.run(Executors.java:665)
      at java.base/java.lang.Thread.run(Thread.java:834)
  Caused by: com.intellij.diagnostic.PluginException: Index com.intellij.indexing.shared.platform.impl.CompositeInvertedIndex@5b5e859 already registered for the name 'sencha.view_model.index' [Plugin: com.sencha.idea.IdeaPlugin]
      ... 19 more
  Caused by: java.lang.IllegalStateException: Index com.intellij.indexing.shared.platform.impl.CompositeInvertedIndex@5b5e859 already registered for the name 'sencha.view_model.index'
      at com.intellij.util.indexing.IndexConfiguration.registerIndex(IndexConfiguration.java:83)
      at com.intellij.util.indexing.FileBasedIndexImpl.initIndexStorage(FileBasedIndexImpl.java:488)
      at com.intellij.util.indexing.FileBasedIndexImpl.registerIndexer(FileBasedIndexImpl.java:439)
      at com.intellij.util.indexing.FileBasedIndexDataInitialization.lambda$initAssociatedDataForExtensions$0(FileBasedIndexDataInitialization.java:79)
      ... 17 more
  </code></pre>