A MSL2024  came up with the following error on the screen. It sounded like a tape had fallen out on the track. You  will need to take the device apart to remove the tape 

1)

Releasing the magazines manually: If you cannot remove the magazines via the OCP or RMI, do the following: 1. Unplug the power cord from the device. 2. From the back of the autoloader, find the access holes for the right and left magazines.

Manual magazine release holes

2) Unscreen the 2 screws on the top and 3 bottom of the front of the unit which should let you remove the screen and get access to the gang way to remove the tape

http://h20564.www2.hpe.com/hpsc/doc/public/display?docId=mmr_kc-0114331