| NO_ERROR | 0 |
| MYSQL_QUERY_ERROR | 1 |
| XML_PARSE_ERROR | 2 |
| DECRYPTION_ERROR | 3 |
| ENCRYPTION_ERROR | 4 |
| FORBIDDEN_OPERATION | 5 |
| OPENSSL_ERROR | 6 |
| PAST_TIME | 7 |
| IV_SIZE_MISMATCH | 8 |
| UNKNOWN_ERROR | 9 |
| UNKNOWN_CLASS | 10 |
| UNKNOWN_METHOD | 11 |
| UNKNOWN_PARAMETER | 12 |
| UNKNOWN_PERMISSION | 13 |
| INSUFFICIENT_PERMISSIONS | 20 |
| ACCOUNT_SUSPENDED | 21 |
| INEXISTENT_USER | 22 |
| CONTACT_ADMIN_SAME_EMAIL | 23 |
| EMAIL_REGISTERED | 24 |
| GROUP_IN_USE | 25 |
| INVALID_CONFIRMATION | 30 |
| INVALID_EMAIL | 31 |
| INVALID_FIELD | 32 |
| INVALID_ID | 33 |
| INVALID_KEY | 34 |
| INVALID_LANGUAGE | 35 |
| INVALID_PASSWORD | 36 |
| INVALID_STATUS | 37 |
| INVALID_VALUE | 38 |
| MISSING_ADMIN_EMAIL | 40 |
| MISSING_ADMIN_FIRST_NAME | 41 |
| MISSING_ADMIN_LAST_NAME | 42 |
| MISSING_ADMIN_PASSWORD | 43 |
| MISSING_COMPANY_NAME | 44 |
| MISSING_CONTACT_EMAIL | 45 |
| MISSING_CONTACT_FIRST_NAME | 46 |
| MISSING_CONTACT_LAST_NAME | 47 |
| MISSING_CONTACT_PASSWORD | 48 |
| MISSING_EMAIL | 49 |
| MISSING_FIRST_NAME | 50 |
| MISSING_KEY | 51 |
| MISSING_LAST_NAME | 52 |
| MISSING_NAME | 53 |
| MISSING_PASSWORD | 54 |
| MISSING_PASSWORD_CONFIRMATION | 55 |
| DELETE_FORBIDDEN | 101 |
| POLICY_NOT_ACCEPTED | 102 |
| EMPTY_LIST | 103 |
| EMPTY_SUBLIST | 104 |
| CAMPAIGN_IN_USE | 104 |
| DELIVERING_SUBLIST_IN_USE | 105 |
| EMAIL_EXISTS | 106 |
| FIELD_IN_USE | 107 |
| LIST_IN_USE | 108 |
| MAXIMUM_LIMIT_REACHED | 109 |
| SUBLIST_IN_USE | 110 |
| INEXISTENT_EMAIL | 150 |
| INEXISTENT_MAILING | 151 |
| INEXISTENT_CAMPAIGN | 152 |
| INEXISTENT_LIST | 153 |
| INEXISTENT_ID | 154 |
| INEXISTENT_INTERFACE | 155 |
| INEXISTENT_SUBLIST | 156 |
| INEXISTENT_JOB | 157 |
| INEXISTENT_TRIGGER | 158 |
| INEXISTENT_SERVER | 159 |
| INVALID_VALUE | 201 |
| MISSING_VALUE | 300 |
| UNKNOWN_ACTION | 400 |
| UNKNOWN_CLASS | 401 |
| UNKNOWN_METHOD | 402 |
| UNKNOWN_PARAMETER | 403 |
| UNKNOWN_INFORMATION | 404 |
| UNKNOWN_TAG | 405 |
| UNKNOWN_TYPE2 | 406 |