Runtime Error!

Bonjour,

During the compilation (ctrl+B) of my code "main.cpp"  everything is fine,no error, but at the execution of my code (ctrl+R) Qt shows me a "Runtime Error!". After i clicked on the button OK Qt shows me "Signal Received" which tell me that a signal is unknown. 

I don't understand because i've already compile some code like my main.cpp and it was ok.

thanks for your help