add a general description to the group of errors

Author: renetapopova

modules/ROOT/pages/errors/gql-errors.adoc

@@ -435,6 +435,8 @@ Status description:: error: syntax error or access rule violation - permission/a
 
 == System configuration or operation exception
 
+System configuration or operation exception errors occur when there is an error in the system configuration or operation, such as procedure registration failure, a missing class field annotation, an unsupported injectable component type, duplicate field names, invalid map key type, etc.
+
 === 51N00
 
 Status description:: error: system configuration or operation exception - procedure registration error. Failed to register procedure.