Synchronisation with TBird only does Contacts

[Gordon Burgess-Parker]

I have two instances of Thunderbird on two different machines. Both are 
2.0.0.12, both have the same Calendar extension installed, both have the 
same version of SyncKolab installed (0.6.0). I set up three IMAP folders 
on GMail for Contacts, Calendar and Tasks. I synched from one instance 
to the IMAP folders OK. When i then tried to synck with the other 
instance, Contacts came over OK but the Calendar did not. the synch box 
said that it couldn'r parse, and the type was unknown.

How do i correct this?