| Code | Explanation |
|---|---|
| 0 | Success |
| 1 | Unknown |
| 2 | App crashed |
| 3 | App exited by user |
| 4 | Invalid *.env* file structure |
| 5 | Invalid credentials (third-party APIs, etc.) |
| 6 | Outdated libraries |
| 7 | Outdated system |
| 8 | Security/cryptography version error |
| 9 | Security/cryptography other error |
| a | Database error |