'Method not found', self::Rpc_Error_Parse_Error => 'Json parse error', self::Rpc_Error_Invalid_Request => 'Invalid request', self::Rpc_Error_Invalid_Params => 'Invalid params', self::Rpc_Error_Internal_Error => 'Internal error', self::Rpc_Error_System_Error => 'System error', self::Rpc_Success => 'Success' ]; }