Error message in Appeon Log

Phenomena: After the script is played back, set the pacing>1 and play back the scripts again, the following error messages appear in the AppeonServer log for AEM:

1154707726562:0 [06-08-04 09:08:46.562] 
[com.appeon.server.services.controller.JRouterImpl (call())] 
The session does not exist.
1154707726593:0 [06-08-04 09:08:46.593]
[com.appeon.server.services.controller.JRouterImpl (call())] 
The session does not exist.
1154707726625:0 [06-08-04 09:08:46.625] 
[com.appeon.server.services.controller.JRouterImpl (call())] 
The session does not exist.
1154707726687:0 [06-08-04 09:08:46.687] 
[com.appeon.server.services.controller.JRouterImpl (call())] 
The session does not exist.
1154707726718:0 [06-08-04 09:08:46.718] 
[com.appeon.server.services.controller.JRouterImpl (call())] 
The session does not exist.

Solution: Make sure that the Simulate a new user each iteration option for Run-time Settings is unchecked.