Random session scope is not enabled

dev support
1

Looking though the exception log and there are loads of these errors (below).

We have a JEE session type set up and session management is turned on. Any idea how I can track down what the issue is?

Thanks

"ERROR","Thread-137380","11/07/2017","13:41:25","",";session scope is not enabled
you can enable session scope with the tag applicationor with the Application.lucee;lucee.runtime.exp.ExpressionException: session scope is not enabled
	at lucee.runtime.PageContextImpl.checkSessionContext(PageContextImpl.java:1350)
	at lucee.runtime.PageContextImpl.sessionScope(PageContextImpl.java:1332)
	at lucee.runtime.listener.ModernAppListener.onSessionEnd(ModernAppListener.java:339)
	at lucee.runtime.type.scope.ScopeContext.clearUnusedMemoryScope(ScopeContext.java:988)
	at lucee.runtime.type.scope.ScopeContext.clearUnused(ScopeContext.java:845)
	at lucee.runtime.engine.Controler.control(Controler.java:275)
	at lucee.runtime.engine.Controler.control(Controler.java:222)
	at lucee.runtime.engine.Controler.access$000(Controler.java:59)
	at lucee.runtime.engine.Controler$ControlerThread.run(Controler.java:110)
"