| Error code | Meaning |
| OK | Success |
| ERR202 | Activation failed. This activation code limits the number of computers that can be activated at the same time. You have reached that limit. If you want to activate software on this computer, please remove one of the previously installed software using “Help -> Uninstall”. |
| ERR001 | Registry key format error. |
| ERR002 | The username field is currently empty. |
| ERR003 | Invalid email address. |
| ERR004 | Invalid MAC address. |
| ERR005 | Invalid MAC address. Please try again. |
| ERR006 | You are not registered yet, please complete all required fields to register. |
| ERR007 | Required fields cannot be left blank. Or some settings in the VPN have blocked activation, please disable any VPN before reactivating. |
| ERR008 | Customer code has not been filled in, please try again. |
| ERR009 | Invalid client ID, please try again. |
| ERR010 | Username is too long. Maximum limit is only 500 characters. |
| ERR101 | Invalid registration key. Please change to another code. |
| ERR102 | The registration key for the new version is invalid. Please use another key. |
| ERR103 | The registration code is not valid for the current version, please install the correct version and try again. |
| ERR104 | Language format error. Correct and try again. |
| ERR105 | The registration code cannot be used for the current language version. |
| ERR106 | Invalid product code. Please check again. |
| ERR107 | The registration code cannot activate this release because the distributor identifier does not match the currently installed software. Please install the correct version and try again. |
| ERR108 | The free upgrade service for this activation code has expired. |
| ERR109 | Activation code has expired. |
| ERR111 | MAC address or IP address is restricted, please run Foxit PDF Editor on a device with an authorized MAC address or connect to authorized IP areas and try again. |
| ERR 112 | The license key file for the Admin Console has expired. Contact Foxit’s sales team to purchase a new license. |
| ERR201 | Unable to download license key file. Check your internet connection and try again. If the problem persists, please contact Foxit technical support team for assistance. |
| ERR203 | Foxit PDF Editor’s license key file has expired. Buy the upgrade. |
| ERR206 | The deactivation process failed because the MAC address of the existing computer to deactivate could not be obtained. Submit a support request to Foxit, providing your registration key and existing computer name. Foxit’s support team will help you deactivate license information on your existing computer. |
| ERR207 | The deactivation process failed because the activation code information could not be obtained. You can try activating the product again and then deactivating it. If the problem persists, please contact Foxit support. |
| ERR208 | Activation failed because Foxit PDF Editor does not work on authorized IP zones. Please connect to authorized IP zones and try again. |
| ERR209 | Activation failed because Foxit PDF Editor does not work on authorized IP zones. Please connect to authorized IP zones and try again. |
| ERR301 | No activations were detected on your account. |
| ERR302 | The registration code you are using has expired, please visit the Foxit online store to renew. |
| ERR303 | The registration code does not exist on this machine, you cannot update, deactivate or renew. |
| ERR304 | The registration code has been disabled on this machine. |
| 413 | The request is too great. |
| 414 | Query URL is too long |
| 415 | Media type is not supported |
| 449 | Please try again after taking appropriate action. |
| 500 | Internal server error |
| 501 | The request is not supported. |
| 502 | Response error. |
| 503 | Temporarily overloaded. |
| 504 | Connection timeout. |
| 505 | HTTP version is not supported |
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