AllNetworksInImmunity

Creating a new subnet required pruning an existing one, but every candidate subnet is still inside its network immunity period so none can be dissolved. Check NetworkImmunityPeriod and each subnet's NetworkRegisteredAt, and retry once a subnet leaves immunity.

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

Remediation

The required window has not opened yet; wait some blocks and retry

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