From Qt Doc:

Note that the signal and slots parameters must not contain any variable names, only the type.

The signature of a signal must match the signature of the receiving slot. (In fact a slot may have a shorter signature than the signal it receives because it can ignore extra arguments.

So:

use only type: Qstring, int and not QString dummy or int Bignumber, only QString or int.
If u can use the same number of parameters too.


Hope this help