This error almost always boils down to one of the following
The pool you’ve select has no media available (with correct retention) to write on or continue writing on (and there are no free media in the scratch pool
There is media available but its density doesn’t match your storage unit’s density eg hcart ot hcart2
There is media available with correct density and in the correct pool but it’s frozen or suspended
Take a closer look at the media available on your pools, which pools the policies are using, storage units details and bpmedlalist to check for frozen media
