Hi Manu,
I haven't worked on this for a while, but here are some things you might try. From the error, it looks like you are trying to load your program into invalid memory and this is why you cannot set the breakpoint. Use the GEL files on the A15 processor to bring the M4 out of reset. I also disabled the run to main as this occurred before the A15 GEL file executed.
Regards,
John