Cannot invoke "com.intellij.openapi.application.ex.ApplicationEx.runIntendedWriteActionOnCurrentThread(java.lang.Runnable)" because the return value of "com.intellij.openapi.application.ex.ApplicationManagerEx.getApplicationEx()" is null

class com.intellij.openapi.wm.impl.TestWindowManager cannot be cast to class com.intellij.openapi.wm.impl.WindowManagerImpl (com.intellij.openapi.wm.impl.TestWindowManager and com.intellij.openapi.wm.impl.WindowManagerImpl are in unnamed module of loader 'app')

class com.intellij.openapi.wm.impl.TestWindowManager cannot be cast to class com.intellij.openapi.wm.impl.WindowManagerImpl (com.intellij.openapi.wm.impl.TestWindowManager and com.intellij.openapi.wm.impl.WindowManagerImpl are in unnamed module of loader 'app')