'ProceedWorkbenchShutdown UIJob' has encountered a problem

I seem to get this error message often:

Problem Occured: ‘ProceedWorkbenchShutdown UIJob’ has encountered a problem.

I seem to have a lot of pop up error messages when going between Notes and Designer clients. When it gets too irritating (3-5 times per day), I shut down and reopen all the Notes related windows. A pain.

Subject: Also get: org.eclipse.swt.SWTException

Also get this a lot:

Problem Occurred

An error has occurred. See error log for more details.

org.eclipse.swt.SWTException

What “error log” is it refering to?