Eclipse Neon: loop event handler exception

Hi,

seit heute bekomme ich einen "Unhandled event loop exception" wenn in Eclipse in den Editor klicke und zwar:

Code (Text):

org.eclipse.swt.SWTError: No more handles
    at org.eclipse.swt.SWT.error(SWT.java:4559)
    at org.eclipse.swt.SWT.error(SWT.java:4448)
    at org.eclipse.swt.SWT.error(SWT.java:4419)
    at org.eclipse.swt.widgets.Widget.error(Widget.java:482)
    at org.eclipse.swt.widgets.Control.createHandle(Control.java:718)
    at...

Eclipse Neon: loop event handler exception

Eclipse Neon: loop event handler exception