Errors/Chain errors
BadEncKeyLen
Check the argument values against the operation schema
The enc_key passed to announce_next_key is not the exact ML-KEM-768 encapsulation key length (1184 bytes). Check the byte length of the enc_key argument before announcing.
Declared by the MevShield 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 BadEncKeyLen.