ContributionPeriodNotEnded

The operation requires the crowdloan's contribution period to be over, but the current block is still before the crowdloan's end block. Compare the end field of the Crowdloans entry for the crowdloan_id with the current block number.

Declared by the Crowdloan 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 ContributionPeriodNotEnded.