Internal error occured: DecodeError "(in 'passphrase' field) suffix is not in base-16 format:

hi guys
anyone know what is this error all about ? Internal error occured: DecodeError "(in ‘passphrase’ field) suffix is not in base-16 format:
i am calling the rpc api
creating new wallet

Either you post your request for troubleshooting or you compare it by yourself with the example referred in this post Generating mnemonic phrase through CLI