Configuration of UPS module in Virtuemart

We need to configure the UPS shipping module in Virtuemart. We have the account number, user name and password. However, it does not seem to connect and it gives an error message. The error says: Error: UPS was not able to process the Shipping Rate Request.. Error Code: 250003, Error Description: Invalid Access License number. We need the UPS configured and this error corrected within a few days. Thank you for bidding on this project.