| Error number | Error message | Additional info and instruction |
|---|
| 6000 | A system error has occurred. Please log in to your test again. |  |
| 6001 | A system error has occurred. Please log in to your test again. |  |
| 6002 | A system error has occurred. Please log in to your test again. |  |
| 6021 | Unable to communicate with the testing server. Please contact your administrator. | Contact your local system or network administrator; the network connection was either not found or lost during authentication. 
|
| 6022 | 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. 
|
| 6023 | Unable to communicate with the testing server. Please contact your administrator. | There was a parser error when saving or retrieving state.

|
| 6024 | Unable to communicate with the testing server. Please contact your administrator. | 

|
| 6025 | There has been a problem loading this item. Please contact your administrator. | 

|