Why Laravel gives me this inexisten error?

I get this error "Trying to get property 'idperiod' of non-object", in the exeption tells me it's at line 46 and there is no idperiod anywhere, the thing is that I don't have that variable by now, I erased and change it for anotherone, but Laravel keep giving me the error, wath could I do to fix this.

I had clean the browser history, and try to clean artisan cache but yet I still get the error.

via Chebli Mohamed