| EmergencyError | Error: system is unusable |
| AlertError | Error: Action must be taken immediately (system/db down, etc) |
| CriticalError | Error: Critical conditions, like component unavailble, etc. |
| Error | Error: Runtime errors that do not require immediate action |
| PageNotFoundException | Exception for automatic logging. |
| ConfigException | Exception for automatic logging. |
| UnknownFileException | Exception for automatic logging. |
| UnknownClassException | Exception for automatic logging. |
| UnknownMethodException | Exception for automatic logging. |
| UserInputException | Exception for automatic logging. |