i forgot to mention that im using the lastest version of telerik reporting
answered on 13 May 2019, 05:59 AM
The error is most probably caused by expired ClientSessionTimeout. Please test using a greater value, but do not set it to infinity as the viewer's records will never be deleted from the cache storage which will affect the general performance. Note that the ClientSessionTimeout expires only if there is no interaction with the viewer for the set time, where each interaction extends the time. When the time expires, the page must be refreshed. There are workarounds like refreshing the viewer on a given interval or refreshing the whole page.
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