| AlertError | Error: Action must be taken immediately (system/db down, etc) |
| CodeIgniter | This class is the core of the framework, and will analyse the request, route it to a controller, and send back the response. |
| ComposerScripts | ComposerScripts |
| ConfigException | Exception for automatic logging. |
| Controller | Class Controller |
| CriticalError | Error: Critical conditions, like component unavailble, etc. |
| EmergencyError | Error: system is unusable |
| Entity | Entity encapsulation, for use with CodeIgniter\Model |
| Error | Error: Runtime errors that do not require immediate action |
| Model | Class Model |
| PageNotFoundException | Exception for automatic logging. |
| UnknownClassException | Exception for automatic logging. |
| UnknownFileException | Exception for automatic logging. |
| UnknownMethodException | Exception for automatic logging. |
| UserInputException | Exception for automatic logging. |