/usr/lib/swipl/library/ext/json/json_rpc_server.pl
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 json_rpc_error(+Code, +Message)
 json_rpc_error(+Code, +Message, +Data)
Normally called from a method implementation to raise an application error.
Arguments:
Code- is an integer. The range -32768 to -32000 is reserved for JSON RPC server errors.
Message- is a short string decribing the error
Data- is optional JSON data that provides context for the error.
Errors
- json_rpc_error(Dict), where Dict contains the JSON RPC defined fields code, message and optionally data.