Asp.net error about webresource. axd, "This is an invalid webresource request ."

the telerik control has been upgraded recently. Several sites on the server use the same Program , in addition, one of the virtual directories of other websites exists. After the upgrade, the telerik tab control on the page cannot always load the style (or Javascript), and the following error is prompted:
This is an invalid webresource request.
userid: Username: URL: https: // sitename/webresource. axd? D = Lpr3N_luqAdg8xOq1GOEn22PkzhPAix8FeJ3YQzFFWN-4yI7Zxq9PSGXZcSbu2syzwXAtX-NN5-ZXZiM_HQuPjhZMUtj5_MOAC0g4VSc6Zwo0cvWOEl0aQq6f8AClTNX7chxbBqMpK7shlEXYLf-g5cxN3KpisPitBlHjZWjBsxR8ZL00 & t = 634873289225813822
urlreferrer: https: // sitename/XXX/xxx. aspx
OS: winnt Browser: Firefox version: 16.0
at system. web. handlers. assemblyresourceloader. system. web. ihttphandler. processrequest (httpcontext context) at system. web. httpapplication. callhandlerexecutionstep. system. web. httpapplication. iexecutionstep. execute () at system. web. httpapplication. executestep (iexecutionstep
step, Boolean & completedsynchronously)

the final solution is to change the web.
/> in config, I changed a number to solve this problem! Is it related to using the same value for multiple sites? I have time to study it.