Error functions display errors and prompt the user for a response. The following list briefly describes each error function:
| Function | Description |
| FlashWindow | Flashes the window by inverting its active/inactive state |
| FormatMessage | Formats an message for display. |
| GetLastError | Gets the error information for the previous error |
| MessageBeep | Generates a beep on the system speaker |
| SetLastError | Sets the current error information |