CodeLite IDE

sometimes, when I compile the program, I get an error

and sometimes all work.
I do not change the code, just compile ...
How is this possible?

This message tells you that you program received 'SIGSEGV' (i.e. it crashed)
I am not sure what you running and how you are compiling your code, but it seems that you are actually running it under the debugger

Eran