GDI+ Error codes?

I have a user who has gotten these two runtime errors while running my app:

Common\GraphicsGDIPlus.cpp: 99
Failure Condition: mGraphics

Common\GraphicsGDIPlus.cpp: 114
Failure Condition: mGraphics

Are the cpp: 99 and cpp:114 error codes? If so, where can I find out what they mean?

Xoxo isn’t raising an exception that I can trap, the user just gets a “Runtime Error” dialog window, so I can’t even tell where in my code the problem is happening except a fairly general description from the user, who says he sometimes (not always) gets these errors when choosing fonts.

In the runtime? So there’s really nothing I can do to puzzle it out?