Each function or method activated in the program returns an error code. Below see the list of more frequent errors which can help you to detect the problem:
| Error Code | Description |
|---|---|
| 0 | Succeeded. |
| 1 | Unknown error. |
| -1 | Non-supported protocol. |
| -2 | Error initializing connection. It can happen when trying to create an object IWialonConnection repeatedly. |
| -3 | Invalid URL address. |
| -5 | Error to resolve proxy server name. |
| -6 | Error to resolve server name. |
| -7 | Error connecting to the given address. It can happen when firewall or antivirus program are set incorrectly. |
| -9 | Access to server denied. |
| -18 | Insufficient data. It is possible if connection to server is broken or in case of server abnormal termination. |
| -22 | Http error. |
| -27 | Internal error while executing query. |
| -28 | Execution timeout is exceeded. |
| -34 | POST query error. |
| -35 | Error connecting through a protected connection (SSL). |
| -36 | It is impossible to continue loading. Connection may be broken. |
| -47 | Too many redirections. |
| -51 | Certificate error. |
| -55 | Data communication error. |
| -56 | Data acquisition error. |
| -80 | Incorrect SSL connection termination. |
| -81 | The socket is not ready to data sending or acquisition. Maybe, all sockets are busy – try to upload unusable applications. |
| -95 | Wialon server error. Use the function GetLastError to retrieve the error text. |
| -96 | Error when operating file input/output. It can happen if the user who is executing the program does not have enough access to read and record data in the temporary folder. |
| -97 | Error processing data. Maybe, the server returned invalid data or was abnormally terminated while executing the inquiry. |
| -98 | Error processing data. Maybe, the server returned nothing or was abnormally terminated while executing the inquiry. |
| -99 | Inquiry to the server is impossible because of incorrect product settings. Please, reinstall ActiveX. |
| -300 | Error when parsing data received from the server. |
| -301 | Error when parsing data received from the server. |
| -302 | Error when parsing data received from the server. |
| -303 | Error when parsing data received from the server. |
| -304 | Error while creating objects. It may be caused by memory lack or if you inquire too many messages. Close other applications and retry. |
| -305 | Not enough memory to unpack data. Close other applications and retry. |