Errors/Chain errors
MaxContributorsReached
A chain-side capacity limit was hit; reduce the size or count of the request
The crowdloan already has the maximum number of distinct contributors, so accounts without an existing contribution are rejected. Compare the contributors_count field of the Crowdloans entry with the MaxContributors pallet constant.
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 MaxContributorsReached.