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java.lang.NullPointerException: 	at com.android.tools.idea.uibuilder.handlers.grid.GridDragHandler.commit(GridDragHandler.java:56)	at com.android.tools.idea.uibuilder.surface.DragDropInteraction$1.run(DragDropInteraction.java:191)	at com.intellij.openapi.application.RunResult.run(RunResult.java:35)	at com.intellij.openapi.command.WriteCommandAction$2.run(WriteCommandAction.java:108)	at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:124)	at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:99)	at com.intellij.openapi.command.WriteCommandAction.performWriteCommandAction(WriteCommandAction.java:103)	at com.intellij.openapi.command.WriteCommandAction.access$000(WriteCommandAction.java:34)	at com.intellij.openapi.command.WriteCommandAction$1.run(WriteCommandAction.java:85)	at com.intellij.openapi.application.impl.ApplicationImpl.invokeAndWait(ApplicationImpl.java:723)	at com.intellij.openapi.command.WriteCommandAction.execute(WriteCommandAction.java:82)	at com.android.tools.idea.uibuilder.surface.DragDropInteraction.moveTo(DragDropInteraction.java:203)	at com.android.tools.idea.uibuilder.surface.DragDropInteraction.end(DragDropInteraction.java:123)