There are two "Unknown" items in my Markers tab for "Java Exception Breakpoints". Any ideas what they are, and how I can get rid of them?

Why do I have unknown breakpoints showing in my Markers tab?

Created Jul 15, 2011 Edited Jul 15, 2011

Viewed 27594

There are two "Unknown" items in my Markers tab for "Java Exception Breakpoints".

Snapshot of Markers tab in Eclipse

Any ideas what they are, and how I can get rid of them?