If you see the error message saying "Cannot export report" from Crystal Reports, you can still export your reports.
From the File menu from the top menu bar, choose "Printer Selection" and choose "Adobe PDF".
From the Forms manager, select the form you want to score and click "Score".
Choose the "Print" radio button under "Output Options".
This will let you save the PDF to any location. The other methods are likely to continue giving you an error.