How to solve "Unable to serialize variant" errors?

Hi there!

I started using Jawin yesterday but I'm stuck in invoking a COM object's
method and am in desperate need of some advice on how to solve my problem.

I managed to call an executable via "new DispatchPtr(...)", but after
creating an Object with my parameters and invoking the function, I get the
error:

"Unable to serialize variant: org.jawin.Variant@d1ad08"

and I can't figure out which of my 7 parameters can't be serialized. The
executed program requires 5 parameters being variants of strings and 2
variants containing dates (as double values). All values have been
transformed to variants before being passed, and I simply don't know, which
of the seven parameters causes the error.

So how could I find out more about the error? I'm using Eclipse 3.1 in
conjunction with Tomcat 5.5 and the most recent version of Jawin (2.0-alpha1).

Any help would be greatly appreciated!

Thank you!