IntellijIDEA team has deprecated class AbstractTreeBuilder which in use for show of KnowledgeViewPane, unfortunately there is not any example how to adapt class for new API classes
com.intellij.diagnostic.PluginException: 'AbstractTreeBuilder' is going to be dropped soon and must not be used [Plugin: nb-mind-map-idea]
at com.intellij.ide.util.treeView.AbstractTreeBuilder.<init>(AbstractTreeBuilder.java:74)
at com.intellij.ide.projectView.BaseProjectTreeBuilder.<init>(BaseProjectTreeBuilder.java:49)
at com.igormaznitsa.ideamindmap.view.KnowledgeViewTreeBuilder.<init>(KnowledgeViewTreeBuilder.java:65)
at com.igormaznitsa.ideamindmap.view.KnowledgeViewPane$4.<init>(KnowledgeViewPane.java:196)
at com.igormaznitsa.ideamindmap.view.KnowledgeViewPane.createBuilder(KnowledgeViewPane.java:196)
at com.igormaznitsa.ideamindmap.view.KnowledgeViewPane.createComponent(KnowledgeViewPane.java:92)
at com.intellij.ide.projectView.impl.ProjectViewImpl.showPane(ProjectViewImpl.java:853)
at com.intellij.ide.projectView.impl.ProjectViewImpl.viewSelectionChanged(ProjectViewImpl.java:1059)
at com.intellij.ide.projectView.impl.ProjectViewImpl$21.selectionChanged(ProjectViewImpl.java:936)
at jdk.internal.reflect.GeneratedMethodAccessor443.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at com.intellij.util.EventDispatcher.dispatchVoidMethod(EventDispatcher.java:120)
at com.intellij.util.EventDispatcher.lambda$createMulticaster$1(EventDispatcher.java:85)
at jdk.proxy2/jdk.proxy2.$Proxy99.selectionChanged(Unknown Source)
at com.intellij.ui.content.impl.ContentManagerImpl.fireSelectionChanged(ContentManagerImpl.java:621)
at com.intellij.ui.content.impl.ContentManagerImpl.addSelectedContent(ContentManagerImpl.java:432)
at com.intellij.ui.content.impl.ContentManagerImpl$2.run(ContentManagerImpl.java:520)
at com.intellij.ui.content.impl.ContentManagerImpl.lambda$setSelectedContent$4(ContentManagerImpl.java:533)
at com.intellij.openapi.util.ActionCallback$ExecutedExecutionCallback.doWhenExecuted(ActionCallback.java:177)
at com.intellij.openapi.util.ActionCallback.doWhenDone(ActionCallback.java:111)
at com.intellij.openapi.util.ActionCallback.doWhenProcessed(ActionCallback.java:129)
at com.intellij.ui.content.impl.ContentManagerImpl.setSelectedContent(ContentManagerImpl.java:533)
at com.intellij.ui.content.impl.ContentManagerImpl.setSelectedContentCB(ContentManagerImpl.java:485)
at com.intellij.openapi.wm.impl.content.SelectContentStep.onChosen(SelectContentStep.kt:30)
at com.intellij.openapi.wm.impl.content.SelectContentStep.onChosen(SelectContentStep.kt:11)
at com.intellij.ui.popup.list.ListPopupImpl._handleSelect(ListPopupImpl.java:476)
at com.intellij.ui.popup.list.ListPopupImpl.handleSelect(ListPopupImpl.java:426)
at com.intellij.ui.popup.list.ListPopupImpl$MyMouseListener.mouseReleased(ListPopupImpl.java:680)
at java.desktop/java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:298)
at java.desktop/java.awt.Component.processMouseEvent(Component.java:6656)
at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3385)
at com.intellij.ui.popup.list.ListPopupImpl$MyList.processMouseEvent(ListPopupImpl.java:745)
at java.desktop/java.awt.Component.processEvent(Component.java:6421)
at java.desktop/java.awt.Container.processEvent(Container.java:2266)
at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:5026)
at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2324)
at java.desktop/java.awt.Component.dispatchEvent(Component.java:4854)
at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4948)
at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4575)
at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4516)
at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2310)
at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2804)
at java.desktop/java.awt.Component.dispatchEvent(Component.java:4854)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:790)
at java.desktop/java.awt.EventQueue$3.run(EventQueue.java:739)
at java.desktop/java.awt.EventQueue$3.run(EventQueue.java:731)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:97)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:763)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:761)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:760)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.kt:667)
at com.intellij.ide.IdeEventQueue.dispatchMouseEvent(IdeEventQueue.kt:615)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.kt:570)
at com.intellij.ide.IdeEventQueue.access$_dispatchEvent(IdeEventQueue.kt:68)
at com.intellij.ide.IdeEventQueue$dispatchEvent$processEventRunnable$1$1$1.compute(IdeEventQueue.kt:349)
at com.intellij.ide.IdeEventQueue$dispatchEvent$processEventRunnable$1$1$1.compute(IdeEventQueue.kt:348)
at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:787)
at com.intellij.ide.IdeEventQueue$dispatchEvent$processEventRunnable$1$1.invoke(IdeEventQueue.kt:348)
at com.intellij.ide.IdeEventQueue$dispatchEvent$processEventRunnable$1$1.invoke(IdeEventQueue.kt:343)
at com.intellij.ide.IdeEventQueueKt.performActivity$lambda$1(IdeEventQueue.kt:995)
at com.intellij.openapi.application.TransactionGuardImpl.performActivity(TransactionGuardImpl.java:113)
at com.intellij.ide.IdeEventQueueKt.performActivity(IdeEventQueue.kt:995)
at com.intellij.ide.IdeEventQueue.dispatchEvent$lambda$4(IdeEventQueue.kt:343)
at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:831)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.kt:385)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:207)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:92)
IntellijIDEA team has deprecated class AbstractTreeBuilder which in use for show of KnowledgeViewPane, unfortunately there is not any example how to adapt class for new API classes