I'm getting an error when putting any item number "Item number appears to be incorrect." even though it is the correct item number

Hello Mark,
Thank you for your question about the issue you are having. This situation usually means that you need to renew your authorization. To renew your authorization, just visit the BidSlammer Preferences page and follow the prompt to "Refresh Your Authorization."
If this does not resolve the issue, please let us know so that we can take the next step.