The following forum message was posted by riite at http://sourceforge.net/projects/pydev/forums/forum/293649/topic/6617728:
I can confirm the same behavior with current Aptana Studio 3 and Eclipse 4.2 + PyDev. It seems to happen if the path to the running Eclipse/Aptana instance contains the '&' character. So the easiest workaround would be to rename those folders in the path. Here's what Aptana logged (gathered from Console.app): [code] Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: !ENTRY com.aptana.shared_core 1 1 2013-01-29 15:03:51.712 Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: !MESSAGE Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: Information about process of adding new interpreter: Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: - Opening dialog to request executable (or jar). Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: !STACK 0 Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: java.lang.RuntimeException: Information about process of adding new interpreter: Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: - Opening dialog to request executable (or jar). Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: at org.python.pydev.core.log.Log.logInfo(Log.java:62) Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: at org.python.pydev.ui.pythonpathconf.AbstractInterpreterEditor.getNewInputObject(A bstractInterpreterEditor.java:1074) Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: at org.python.copiedfromeclipsesrc.PythonListEditor.addPressed(PythonListEditor.jav a:135) Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: at org.python.copiedfromeclipsesrc.PythonListEditor$1.widgetSelected(PythonListEdit or.java:225) Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:240) Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4128) Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1457) Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1480) Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1465) Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1270) Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3974) Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3613) Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: at org.eclipse.jface.window.Window.runEventLoop(Window.java:825) Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: at org.eclipse.jface.window.Window.open(Window.java:801) Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: at org.eclipse.ui.internal.dialogs.WorkbenchPreferenceDialog.open(WorkbenchPreferen ceDialog.java:215) Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: at org.eclipse.ui.internal.handlers.ShowPreferencePageHandler.execute(ShowPreferenc ePageHandler.java:54) Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:293) Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: at org.eclipse.core.commands.Command.executeWithChecks(Command.java:476) Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: at org.eclipse.ui.internal.handlers.HandlerService.executeCommand(HandlerService.ja va:178) Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: at org.eclipse.ui.internal.cocoa.CocoaUIEnhancer.runCommand(CocoaUIEnhancer.java:39 3) Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: at org.eclipse.ui.internal.cocoa.CocoaUIEnhancer.actionProc(CocoaUIEnhancer.java:53 5) Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: at org.eclipse.ui.internal.cocoa.CocoaUIEnhancer.actionProc(CocoaUIEnhancer.java:52 0) Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method) Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: at org.eclipse.swt.widgets.Display.applicationSendEvent(Display.java:4989) Jan 29 15:03:51 ********* [0x0-0x330330].com.aptana.studio3[67527]: at org.eclipse.swt.widgets.Display.applicationProc(Display.java:5138) Jan 29 15:03:51 ********* [0x0-0x330330].com.ap ------------------------------------------------------------------------------ Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, MVC, Windows 8 Apps, JavaScript and much more. 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