In a Rails project I can copy/paste a Ruby file just file using ctrl-c, ctrl-v. However, this doesn't work for RHTML files at all. There is an error in the idea.log file: java.lang.NullPointerException at com.intellij.psi.impl.source.PsiFileImpl.clone(PsiFileImpl.java:47) at com.intellij.psi.impl.source.PsiFileImpl.clone(PsiFileImpl.java:44) at com.intellij.psi.impl.source.TreeWrapperPsiElement.copy(TreeWrapperPsiElement.java:25) at com.intellij.refactoring.copy.CopyHandler.a(CopyHandler.java:135) at com.intellij.refactoring.copy.CopyHandler.access$100(CopyHandler.java:12) at com.intellij.refactoring.copy.CopyHandler$3$1.run(CopyHandler.java:3) at com.intellij.openapi.application.impl.ApplicationImpl$9.compute(ApplicationImpl.java) at com.intellij.psi.impl.source.PostprocessReformattingAspect.postponeFormattingInside(PostprocessReformattingAspect.java:100) at com.intellij.openapi.application.impl.ApplicationImpl.runWriteAction(ApplicationImpl.java:377) at com.intellij.refactoring.copy.CopyHandler$3.run(CopyHandler.java:0) at com.intellij.openapi.command.impl.CommandProcessorImpl.executeCommand(CommandProcessorImpl.java:22) at com.intellij.openapi.command.impl.CommandProcessorImpl.executeCommand(CommandProcessorImpl.java:76) at com.intellij.refactoring.copy.CopyHandler.a(CopyHandler.java:56) at com.intellij.refactoring.copy.CopyHandler.doCopy(CopyHandler.java:34) at com.intellij.ide.CopyPasteManagerEx$CopyPasteDelegator$MyEditable.performPaste(CopyPasteManagerEx.java:38) at com.intellij.ide.actions.PasteAction.actionPerformed(PasteAction.java:4) at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher.a(IdeKeyEventDispatcher.java:124) at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher.b(IdeKeyEventDispatcher.java:127) at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher.dispatchKeyEvent(IdeKeyEventDispatcher.java:70) at com.intellij.ide.IdeEventQueue.a(IdeEventQueue.java:47) at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:73) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160) at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)