error method
send error of code
and message
with optional requestId
if error related to request also data
if error has any
Implementation
void error({
required int code,
required String message,
int? requestId,
RpcMeta? data,
}) {
final error = RpcError(code: code, message: message, data: data);
final response = RpcResponse(id: requestId, error: error);
sendRpc(response);
}