JavaScript runtime error Sys.WebForms.PageRequestManagerServerErrorException - Value cannot be null.
Environment
| Product | Progress® Telerik® Reporting |
| Report Viewer | ASP.NET Web Forms Report Viewer |
Relates to the Legacy Report Viewer
Description
The error is thrown when testing a Web Application in browser, run from Visual Studio 2013+.
Error Message
0x800a139e - JavaScript runtime error: Sys.WebForms.PageRequestManagerServerErrorException: Value cannot be null.
Possible Cause
Such error can occur if the Web application is Ajaxified.
Solution
BrowserLink is introduced in Visual Studio 2013. It can intersect AJAX calls, resulting in a JavaScript runtime error.
To test the application you can switch off BrowserLink from Visual Studio settings.
See Also
Using Browser Link in Visual Studio 2013 (source www.asp.net).