I have this code on a button:

SerReceiveFlush(refno,1);
error=SerReceiveWait(refno,sizeof(data),-1);
error=SerReceiveCheck(refno,&numBytesRestantes);
if (numBytesRestantes>0) {
        ULong numBytes;
        numBytes=SerReceive(refno,data,numBytesRestantes,0,&error);
        FrmCustomAlert(Serie2Alert," "," ",NULL);
                        }

when I push this button,i get a fatal exception.why??

which are the causes of a fatal exception??

is in this list any people from spain??

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