theres an error (-1) when I try to restore my iPad what does it mean?

The support article you came here from should provide you with the steps needed to try to resolve this issue. Have you tried them all yet? If so, and they didn't help, I suggest that you contact Apple Support directly. To do so, simply

select the "Support" link in the lower left-hand side of this forum's web page.

In addition, you may find the following support article helpful:

• If you can't back up your iOS or iPadOS device to a computer or restore it from a backup - Apple Support