Errors/Chain errors
MinimumContributionTooHigh
Check the argument values against the operation schema
The new_min_contribution passed to update_min_contribution exceeds the crowdloan's configured per-contributor maximum. Compare it with the MaxContributions entry for the crowdloan_id.
Declared by the Crowdloan pallet; it classifies to the semantic code invalid_argument.
Remediation
Check the argument values against the operation schema
The same explanation is available in the terminal: btcli explain MinimumContributionTooHigh.