Converter3252.fakeConstructor : no matched Converter!!

[j...@sitemule.com]

Hi

I'm trying to make an ECLSession, the properties are:
properties.put(Session.HOST, "myhost");
properties.put(Session.SESSION_TYPE, String.valueOf(ECLSession.SESSION_TYPE_5250));
properties.put(Session.CODE_PAGE, ECLSession.SESSION_CODE_PAGE_DENMARK);
// Add some KeyPad bean properties
properties.put(KeyPad.SHAPE, KeyPad.S2X11);
But if I then do a new ECLSession(properties) I get:
Converter3252.fakeConstructor : no matched Converter!!
Converter3252.fakeConstructor : no matched Converter!!
Fatal error in DS3270.createTransport: null
Error loading tn3270.NVT3270 class

And it crashes.
It does this immediately, no delay, so it seems as if it does not even attempt the connection to "myhost" which in my case is an IP with which I do use tn5270 for, so I know the host is there.
Using tn5270 does not require any TLS or the like.

Any help would be much appreciated.