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java.lang.NoClassDefFoundError: org/scalaide/core/IScalaProject	at org.scalaide.worksheet.ScriptCompilationUnit.scalaProject$lzycompute(ScriptCompilationUnit.scala:33)	at org.scalaide.worksheet.ScriptCompilationUnit.scalaProject(ScriptCompilationUnit.scala:33)	at org.scalaide.worksheet.ScriptCompilationUnit.askReload(ScriptCompilationUnit.scala:77)	at org.scalaide.worksheet.reconciler.ScalaReconcilingStrategy$reloader$.documentChanged(ScalaReconcilingStrategy.scala:42)	at org.eclipse.jface.text.AbstractDocument.doFireDocumentChanged2(AbstractDocument.java:769)	at org.eclipse.jface.text.AbstractDocument.doFireDocumentChanged(AbstractDocument.java:736)	at org.eclipse.jface.text.AbstractDocument.doFireDocumentChanged(AbstractDocument.java:721)	at org.eclipse.jface.text.AbstractDocument.fireDocumentChanged(AbstractDocument.java:796)	at org.eclipse.jface.text.AbstractDocument.replace(AbstractDocument.java:1191)	at org.eclipse.jface.text.AbstractDocument.replace(AbstractDocument.java:1210)	at org.eclipse.jface.text.DefaultDocumentAdapter.replaceTextRange(DefaultDocumentAdapter.java:248)	at org.eclipse.swt.custom.StyledText.modifyContent(StyledText.java:7198)	at org.eclipse.swt.custom.StyledText.sendKeyEvent(StyledText.java:8030)	at org.eclipse.swt.custom.StyledText.doContent(StyledText.java:2474)	at org.eclipse.swt.custom.StyledText.handleKey(StyledText.java:5928)	at org.eclipse.swt.custom.StyledText.handleKeyDown(StyledText.java:5959)	at org.eclipse.swt.custom.StyledText$7.handleEvent(StyledText.java:5636)	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1392)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1416)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1401)	at org.eclipse.swt.widgets.Widget.sendIMKeyEvent(Widget.java:1478)	at org.eclipse.swt.widgets.Control.gtk_commit(Control.java:3021)	at org.eclipse.swt.widgets.Canvas.gtk_commit(Canvas.java:160)	at org.eclipse.swt.widgets.Widget.windowProc(Widget.java:2080)	at org.eclipse.swt.widgets.Control.windowProc(Control.java:5467)	at org.eclipse.swt.widgets.Display.windowProc(Display.java:4569)	at org.eclipse.swt.internal.gtk.OS._gtk_im_context_filter_keypress(Native Method)	at org.eclipse.swt.internal.gtk.OS.gtk_im_context_filter_keypress(OS.java:8181)	at org.eclipse.swt.widgets.Control.filterKey(Control.java:2368)	at org.eclipse.swt.widgets.Control.gtk_key_press_event(Control.java:3229)	at org.eclipse.swt.widgets.Composite.gtk_key_press_event(Composite.java:758)	at org.eclipse.swt.widgets.Widget.windowProc(Widget.java:2096)	at org.eclipse.swt.widgets.Control.windowProc(Control.java:5467)	at org.eclipse.swt.widgets.Display.windowProc(Display.java:4569)	at org.eclipse.swt.internal.gtk.OS._gtk_main_do_event(Native Method)	at org.eclipse.swt.internal.gtk.OS.gtk_main_do_event(OS.java:8756)	at org.eclipse.swt.widgets.Display.eventProc(Display.java:1243)	at org.eclipse.swt.internal.gtk.OS._g_main_context_iteration(Native Method)	at org.eclipse.swt.internal.gtk.OS.g_main_context_iteration(OS.java:2302)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3361)	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1113)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:997)	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:140)	at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:611)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:567)	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124)	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:354)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:181)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:636)	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:591)	at org.eclipse.equinox.launcher.Main.run(Main.java:1450)	at org.eclipse.equinox.launcher.Main.main(Main.java:1426)