Error editing a file

[jerolba]

I get this error creating a new file.
I tested with 10CE , and 10.5CE versions

java.lang.NoClassDefFoundError: com/intellij/psi/impl/source/tree/PlainTextFileElement
at coffeescript.lang.ParserDefinition$1.parse(Unknown Source)
at com.intellij.psi.tree.IFileElementType.parseContents(IFileElementType.java:41)
at com.intellij.psi.impl.source.tree.LazyParseableElement.ensureParsed(LazyParseableElement.java:177)
at com.intellij.psi.impl.source.tree.LazyParseableElement.getFirstChildNode(LazyParseableElement.java:218)
at com.intellij.psi.impl.source.tree.LazyParseableElement.getFirstChildNode(LazyParseableElement.java:32)
at com.intellij.psi.impl.source.tree.SharedImplUtil.getFirstChild(SharedImplUtil.java:47)
at com.intellij.psi.impl.source.PsiFileImpl.getFirstChild(PsiFileImpl.java:704)
at com.intellij.psi.SingleRootFileViewProvider.findElementAt(SingleRootFileViewProvider.java:388)
at com.intellij.psi.SingleRootFileViewProvider.findElementAt(SingleRootFileViewProvider.java:343)
at com.intellij.psi.impl.source.tree.injected.InjectedLanguageUtil.findInjectedElementNoCommitWithOffset(InjectedLanguageUtil.java:246)
at com.intellij.psi.impl.source.tree.injected.InjectedLanguageUtil.findInjectedElementNoCommit(InjectedLanguageUtil.java:257)
at com.intellij.psi.impl.source.tree.injected.InjectedLanguageUtil.findInjectedPsiNoCommit(InjectedLanguageUtil.java:171)
at com.intellij.psi.impl.source.tree.injected.InjectedLanguageUtil.getEditorForInjectedLanguageNoCommit(InjectedLanguageUtil.java:147)
at com.intellij.codeInsight.navigation.CtrlMouseHandler$5.mouseMoved(CtrlMouseHandler.java:159)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.intellij.util.EventDispatcher.dispatch(EventDispatcher.java:89)
at com.intellij.util.EventDispatcher.access$100(EventDispatcher.java:34)
at com.intellij.util.EventDispatcher$1.invoke(EventDispatcher.java:65)
at $Proxy22.mouseMoved(Unknown Source)
at com.intellij.openapi.editor.impl.EditorImpl$MyMouseMotionListener.mouseMoved(EditorImpl.java:5023)
at java.awt.Component.processMouseMotionEvent(Component.java:6419)
at javax.swing.JComponent.processMouseMotionEvent(JComponent.java:3285)
at java.awt.Component.processEvent(Component.java:6143)
at java.awt.Container.processEvent(Container.java:2085)
at java.awt.Component.dispatchEventImpl(Component.java:4736)
at java.awt.Container.dispatchEventImpl(Container.java:2143)
at java.awt.Component.dispatchEvent(Component.java:4566)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4621)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4295)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4212)
at java.awt.Container.dispatchEventImpl(Container.java:2129)
at java.awt.Window.dispatchEventImpl(Window.java:2478)
at java.awt.Component.dispatchEvent(Component.java:4566)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:680)
at java.awt.EventQueue.access$000(EventQueue.java:86)
at java.awt.EventQueue$1.run(EventQueue.java:639)
at java.awt.EventQueue$1.run(EventQueue.java:637)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
at java.awt.EventQueue$2.run(EventQueue.java:653)
at java.awt.EventQueue$2.run(EventQueue.java:651)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:650)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:661)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:510)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:410)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:368)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)