Missing crypto for encryption entry

Hello,

I am testing the soapUI tool, to see if this is a useful program (I'm pretty sure of it by now :-)).
The testing is done calling a webservice which should only be responsive/useful when you have certain certificates installed.

However, upon executing a request in soapUI, I notice this in my error log:
Wed Jan 09 14:41:39 CET 2013:ERROR:java.lang.Exception: Missing crypto [***.jks] for encryption entry

What exactly does this mean? Are the certificates not installed? Or is this a configuration error?

Thanks in advance!