This message can appear in the log in two cases, depending on log message immediately after it:
1. "VerifyBlockMiner: Block 00... (height yy) miner verification skipped"
Your node received block out of order and it doesn't see one of the blocks before it.
It is normal situation, though it should appear rarely if the network load is not very high. The situation will be automatically resolved when the node receives that missing block.
2. "VerifyBlockMiner: Block 00... (height yy) miner verification failed"
This may happens when block on height yy is expected to be on the disk. In this case it is result of some disk failure or bug.
In this situation, it is likely your chain will be stuck (unless disk failure was resolved somehow).
If this is a case we would like to see 10 rows before and 30 rows after this message