Loading a QRP File on QuickReports

Hi. Im trying to load a QRP file on QR3.05 and Builder 5.0

I try this.

    Form->QRPreview1->QRPrinter = this->QuickRep1->QRPrinter;


and this message appears: "QRPrinter not ready". How can i do that? The
printer is ok; i can generate report and print them but doesnt allow me to
load a file.

What am i doing wrong?