Fail to open Export Path Rules

Forum: MemoQ support
Topic: Fail to open Export Path Rules
Poster: Profdoc

When I open a memoQ project and try to open Export Path Rules under Tools > Options > Default Resouces, I get the error message below. Does anybody know what it means and how I solve the problem?

"ResourceListing.QueryFailed
General error."

Details:

"TYPE:
System.NullReferenceException

MESSAGE:
Object reference not set to an instance of an object.

SOURCE:
System.Windows.Forms

CALL STACK:
at System.Windows.Forms.Control.MarshaledInvoke(Control caller, Delegate method, Object[] args, Boolean synchronous)
at System.Windows.Forms.Control.Invoke(Delegate method, Object[] args)
at MemoQ.Controls.ResFx.ResourceListController.fireInfoListChanged()
at MemoQ.Controls.ResFx.ResourceListController.doWork()
at MemoQ.Controls.ResFx.ResourceListController.executeInBackground(Object data)"