| class  | ClassHasNoFields | Diagnostic, if class has no fields. | 
| class  | DefragmentRecommendation | Diagnostic to recommend Defragment when needed. | 
| class  | DeletionFailed | Diagnostic on failed delete. | 
| class  | DescendIntoTranslator | Query tries to descend into a field of a class that is configured to be translated
 (and thus cannot be descended into). | 
| class  | LoadedFromClassIndex | Diagnostic, if query was required to load candidate set from class index. | 
| class  | MissingClass | Diagnostic if class not found | 
| class  | NativeQueryNotOptimized | Diagnostic, if Native Query can not be run optimized. | 
| class  | NativeQueryOptimizerNotLoaded |  | 
| class  | ObjectFieldDoesNotExist |  | 
| class  | UpdateDepthGreaterOne | Diagnostic, if update depth greater than 1. |