"System Program Problem Detected"

I installed the mini version of Trisquel and then Xfce4, my preferred desktop. Everything seems to be running fine except that I get this error message whenever I boot into XFCE. The pop up dialog, "System Program Problem Detected", gives me two options, "Cancel" and "Report", but no indication of what the problem is. Like I said, everything seems to be running fine so I just want to know how to prevent the box from coming up. I checked Xorg.0.log, but couldn't see anything obvious in that. Can someone help me?