when i add a button or anything on constraint layout , i cant access the GUI properties of that item and autocomplete not working the error is null java.lang.NullPointerException at com.android.tools.idea.uibuilder.property.editors.NlReferenceEditor$CompletionProvider.updateCompletions(NlReferenceEditor.java:441) at com.android.tools.idea.uibuilder.property.editors.NlReferenceEditor$3.focusGained(NlReferenceEditor.java:144) at com.intellij.ui.EditorTextField.focusGained(EditorTextField.java:766) at java.awt.AWTEventMulticaster.focusGained(AWTEventMulticaster.java:220) at java.awt.AWTEventMulticaster.focusGained(AWTEventMulticaster.java:219) at java.awt.AWTEventMulticaster.focusGained(AWTEventMulticaster.java:219) at java.awt.AWTEventMulticaster.focusGained(AWTEventMulticaster.java:219) at java.awt.AWTEventMulticaster.focusGained(AWTEventMulticaster.java:219) at java.awt.Component.processFocusEvent(Component.java:6422) at java.awt.Component.processEvent(Component.java:6289) at java.awt.Container.processEvent(Container.java:2236) at java.awt.Component.dispatchEventImpl(Component.java:4889) at java.awt.Container.dispatchEventImpl(Container.java:2294) at java.awt.Component.dispatchEvent(Component.java:4711) at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1954) at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:986) at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:610) at java.awt.Component.dispatchEventImpl(Component.java:4760) at java.awt.Container.dispatchEventImpl(Container.java:2294) at java.awt.Component.dispatchEvent(Component.java:4711) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758) at java.awt.EventQueue.access$500(EventQueue.java:97) at java.awt.EventQueue$3.run(EventQueue.java:709) at java.awt.EventQueue$3.run(EventQueue.java:703) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90) at java.awt.EventQueue$4.run(EventQueue.java:731) at java.awt.EventQueue$4.run(EventQueue.java:729) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80) at java.awt.EventQueue.dispatchEvent(EventQueue.java:728) at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:795) at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:631) at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:387) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
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