Stepping over a library (in-built) function in CodeWarrior
This particular Eclipse trash IDE is useless for troubleshooting - it's one of the worst IDEs ever made, all categories. In a real debugger you'd just peek at the program counter and if it says 0xFFFF then that's a problem.
As for the error, it isn't related to you not having access to the source. The program counter has likely jumped to some location 0xFFFF where it attempts to execute instruction 0xFF... - that is, you have runaway code and the ELF file contains no C source for nonsense location 0xFFFF, hence no source available.

Without starting the debugger, disassembly the source file and verify that there's actually proper function call there.

If so, then you maybe didn't get the part flashed correctly (0xFFFF typically means unprogrammed flash) - perhaps Codewarrior gave you a RAM build instead of a flash one, or there was some issue during flashing.

Otherwise you could have some run-time phenomenon such as watchdog kicking in, LVD kicking in, some other reset, or stack overflow, or unhandled interrupts etc etc.


I would strongly recommend getting a better toolchain so that you can troubleshoot these kind of issues.