pedb detected a source file that appears to be newer than the executable file being debugged. If the file was changed since the executable file was built, the code displayed in the source window will not match the object.
If one of the source files has been changed, quit the debugger and recompile. This will insure that movement through the program will be correctly depicted in the source area of pedb. If the modification time of the source file is due to copying or tar'ing the file there should not be any mismatch between the actual position in the program and the displayed in the source area. In this case, updating the modification time of the executable with the touch command will prevent this message from appearing.