json_rpc_error(+Code,
+Message)| 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. |
json_rpc_error(Dict), where Dict contains the
JSON RPC defined fields code, message and
optionally data.