i'm facing the following error when i deploy the Access Control policy
one of the 5525x firepower succeed while the other fail.
the FMC is a virtual appliance.
even when i deploy a basic any to any policy
I also faced this problem a couple of times with some ASAs with Firepower module and had TAC-cases open for that. The result typically was to just reinstall the module and reapply the policy. Probably not an answer you hoped for, but at least it got me out of these situations.
I have the same issue on some asa5525+fpr and I found that reloading the device (reload command on asa) solves the issue for some weeks.
Not a good solution, but better than reimaging.
Release is 188.8.131.52, soon I'll move to 6.4 and see if the issue disappear.