The Folderlist &2 can't be assigned to Session &1 as they belong to different sites.
&1 - The Session ID
&2 - The folder list name
An attempt has been made to assign a folder list to a session. The attempt failed as the folder list and the session belongs to different sites. This will typically occur when calling the SessionSetFolderList API.
The developer responsible for the business process must ensure that when a folder lists that is being assigned to a session belongs to the same site as the session does.