I was moving my class from one package to the other and I got this trace on the console
 
java.lang.NullPointerException
        at com.intellij.refactoring.a.c.e.a(e.java:8)
        at com.intellij.refactoring.a.c.e.a(e.java:40)
        at com.intellij.refactoring.a.c.e.a(e.java:19)
        at com.intellij.refactoring.a.e.a(e.java:104)
        at com.intellij.ide.k.run(k.java:15)
        at com.intellij.openapi.c.a.b.a(b.java:199)
        at com.intellij.psi.impl.PsiManagerImpl.a(PsiManagerImpl.java:117)
        at com.intellij.ide.CopyPasteManager$CopyPasteDelegator$PasteActionDeleg
ate.actionPerformed(CopyPasteManager.java:1)
        at com.intellij.ide.o.g(o.java:1)
        at com.intellij.ide.actions.PasteAction.actionPerformed(PasteAction.java
:7)
        at com.intellij.openapi.actionSystem.impl.k.actionPerformed(k.java:5)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:14
50)
        at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(Abstra
ctButton.java:1504)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel
.java:378)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:250
)
        at javax.swing.AbstractButton.doClick(AbstractButton.java:279)
        at javax.swing.plaf.basic.BasicMenuItemUI$MouseInputHandler.mouseRelease
d(BasicMenuItemUI.java:886)
        at java.awt.Component.processMouseEvent(Component.java:3715)
        at java.awt.Component.processEvent(Component.java:3544)
        at java.awt.Container.processEvent(Container.java:1164)
        at java.awt.Component.dispatchEventImpl(Component.java:2593)
        at java.awt.Container.dispatchEventImpl(Container.java:1213)
        at java.awt.Component.dispatchEvent(Component.java:2497)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:2451
)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:2216)
 
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:2125)
        at java.awt.Container.dispatchEventImpl(Container.java:1200)
        at java.awt.Window.dispatchEventImpl(Window.java:926)
        at java.awt.Component.dispatchEvent(Component.java:2497)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:339)
        at com.intellij.ide.c.dispatchEvent(c.java:40)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchTh
read.java:131)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre
ad.java:98)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:85)
 
 

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