Errors without HTTP error codes
Some Web Station errors carry no HTTP error code such as 400 or 500. Collect the browser console output for those.1
Open the Developer console
Press F12 and go to the Console tab.

2
Copy the error list
Copy everything the console displays.
3
Enable logging and reproduce the error
Turn on logging for the Web Station that displays the error, then reproduce it. For more information, see Web Station logging.
4
Contact ABBYY technical support
Send the error list from the Console tab together with the Web Station log files.
Parameter cannot be null.
Errors with HTTP error codes
Other errors appear in a window with an HTTP error code, for exampleError 400: bad request or Error 500 while completing task.
1
Check the Application Server system log
Look for errors recorded around the time the Web Station error appeared.
2
Enable the logging that matches the error
If the error is intermittent, enable logging on the Web Station that reports it. For more information, see Web Station logging.If the error reproduces reliably, enable Fiddler logging instead. For more information, see Fiddler logging.
3
Contact ABBYY technical support
Send the Web Station logs and the Fiddler logs covering the period when the error occurred.
The Cannot get license ticket error on Web Stations
This error can appear when you open a job, or when you try to scan or add an image to a batch.

- The Processing Server is running.
- Free licenses are available. To check, launch the License Manager, select a license, and go to Service → License Usage Statistic in the main menu.

