This simply means that the iCap server does not know of an Access Code by the name you typed in. Check your typing for errors, and remember that the Access Code is case-sensitive. If you definitely typed the correct Access Code, you may need to contact your Administrator to find out why the server can't find the Access Code you have.
If you have a password to access the iCap Administrative site, you can make sure the Access Code exists by going to the Access Code tab in your company's account. If the Access Code does not exist, you can either create it (if you own the encoder, or the encoder has been set up to give you permission to create your own Access Codes), or contact the encoder administrator to get an Access Code set up.