LabVIEW Unit Test Framework: mysterious error message

Hi,

I'm using LabVIEW's Unit Test Framework with setup and teardown VIs and I'm getting the following error (in German):

"LabVIEW:  Ungültiger Anschluss.

Methodenname: Element an Anschluss zuweisen"

In English something like:

"LabVIEW:  Invalid connection.

Method name: Assign element to connector."

The strange thing is that it works both 1) with the setup.vi but without the teardown.vi and 2) with the

teardown.vi but without the setup.vi, but it doesn't work if they're used at the same time.

Any help/hint would be welcome.

Peter