InvalidWorkBlock

The block_number in the proof-of-work submission is in the future or more than 3 blocks old, so the work is stale. Compare the submitted block number with the current chain height and regenerate the PoW against a fresh block.

Declared by the SubtensorModule pallet; it classifies to the semantic code invalid_argument.

Remediation

Check the argument values against the operation schema

The same explanation is available in the terminal: btcli explain InvalidWorkBlock.