TooSoon

Wait for the rate-limit window to pass, then retry

A forced GRANDPA authority change was signalled too soon after the previous one. Check the Grandpa NextForced storage and wait until the current block passes it before signalling another forced change.

Declared by the Grandpa pallet; it classifies to the semantic code rate_limited.

Remediation

Wait for the rate-limit window to pass, then retry

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