There are a number of reasons for this error. However, the most likely reason is that you shipping number has not been added to your UPS.com profile.

Follow these steps to verify that you have the correct information in your ups.com profile:

  1. Log in to ups.com (Be sure to use the same User ID and Password that is in the carrier account settings)
     
  2. Select Account Summary from the My UPS tab rollover menu. 
     
  3. Verify your account is listed; if not, select the Add a UPS Account link and follow the instructions to add the account