I went to divide a title on my recorder today and it said U99 error and now it won't display anything but U99, I have rebooted, unplugged, but nothing works,.

could someone please tell me what to do and how to get this error off, please I need to record tonight, (in just a few hours) please someone tell me what to do to fix it, or if it even can be fixed.

thank you so much for any help in advance