what does Error “Thread 1:EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)” mean?

I got a error here when I try to build in the simulator

dyld_sim`dyld_fatal_error:
    0x101799000 <+0>: int3   
->  0x101799001 <+1>: nop