# NoNeuronIdAvailable (/docs/errors/chain/NoNeuronIdAvailable)

Registration could not obtain a uid: the subnet's `MaxAllowedUids` is 0, or the subnet is full and every neuron is immune from pruning. Check `SubnetworkN` versus `MaxAllowedUids` for the netuid and retry after immunity periods expire.

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 NoNeuronIdAvailable`.