Errors/Chain errors
MaxContributionReached
A chain-side capacity limit was hit; reduce the size or count of the request
The contributor's cumulative contribution already equals the crowdloan's per-contributor cap, so further contributions are rejected. Compare their Contributions entry with the MaxContributions value for the crowdloan_id.
Declared by the Crowdloan pallet; it classifies to the semantic code limit_exceeded.
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 MaxContributionReached.