# TooManyUIDsPerMechanism (/docs/errors/chain/TooManyUIDsPerMechanism)

Setting max UIDs or mechanism count would make max\_uids times mechanism\_count exceed the chain default of 256 UIDs per subnet. Check `MaxAllowedUids` and the subnet's mechanism count so their product stays within the limit.

Declared by the `SubtensorModule` pallet; it classifies to the semantic code [`limit_exceeded`](/docs/errors/limit-exceeded).

## Remediation [#remediation]

A chain-side capacity limit was hit; reduce the size or count of the request

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