12.1.0 apm log error: Access encountered error: ERR_NOT_FOUND

After we upgraded BIG-IP to 12.1.0, Build 0.0.1434 last weekend, we started getting quite a lot of these errors in the apm log:   Jun 2 08:17:19 bigip-nnn err tmm[21193]: 01490514:3: (null):Commo...