Errors/Chain errors
RandomSubjectTooLong
A chain-side capacity limit was hit; reduce the size or count of the request
The subject buffer given to the deprecated seal_random API exceeds the schedule's subject_len limit. Shorten the randomness subject the contract passes or check the schedule's limits section.
Declared by the Contracts 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 RandomSubjectTooLong.