| Error number | Error message | Additional info and instruction |
|---|
| 8021 | Unable to communicate with the testing server. Please contact your administrator. |  The network connection was either not found or the connection was lost during authentication.
|
| 8022 | Unable to communicate with the testing server. Please contact your administrator. | The testing server URL that was requested was not found (404) or there was an internal server error (500) during authentication.
|
| 8023 | Unable to communicate with the testing server. Please contact your administrator. |  
|
| 8024 | Unable to communicate with the testing server. Please contact your administrator. | 
|
| 8025 | There has been a problem loading this item. Please contact your administrator. | 
|
| 8026 | Unable to connect to the proctor caching computer. Please contact your administrator. |
|
| 8027 | iOS: The testing server can not be reached. Please verify your internet connection and then choose Retry, or close the app and try again later. ChromeOS: The application start page server can not be reached. Please verify your internet connection and then choose retry, or close the app and try again later. | A network connection could not be established.
|
| 8028 | The java applet is unable to load. This can occur when Oracle disables an existing version of Java because a new version has been released that contains critical fixes. Please upgrade to the latest version of Java. | Upgrade Java on your machine. |
| 8029 | The installed app is out of date and needs to be updated in order to use TestNav on this device. | Download and install the latest version of the app. |
| 8030 | A required file has been changed, and the test cannot start. Please contact your administrator. | A required file has been changed. |
| 8031 | Chrome app is unable to start. Please contact your administrator and have your device restarted. |  |