Error WRE 00005 (Invalid Session) is returned in the burst or XDC activity log during REFRESH.
The error is caused by a timeout setting in the XI 3.1 BusinessObjects Tomcat server.
Modify the timeout value on the Tomcat server.
There is no specific setting recommendation. Experiment by increasing the setting in increments of 600 seconds until the issue is resolved.
Please consult your Business Objects administrator prior to implementing this resolution.