Your question is not very clear.
Is the drive not accepting a new tape or is it not accepting a new cleaning tape?
LTO Cleaning tapes have a life span of between 20 and 50 cleans and once they go above this they expire and do not work again. I suggest you try using a brand new cleaning tape to try the cleaning cycle again and then try your backup again with a brand new tape too. This should eliminate all your media from you list of problems.
If the Superloader continues to either reject tapes or the cleaning light / alert persists then i am afraid it will need to be sent for repair as it is likely the read write heads will need replacement / service.
Visit the link below and they should be able to help and offer a full warranty too.
Autoloader Repair Service Adv Exch loan units available