[sync] SynML Error (Call to a member function in a non-object) - HowTo ?

[Wolfgang Schmidt]

Hello,

I try to synchronize with Horde. I've used  Sync4J, with Synchr. 
settings Calendar and Server Remote Settings as "calendar". In the log 
on the server are only debug messages, no error ist shown. The log on 
the client shows that the sync is using slow sync, and 25 items are send 
from the client to the server. After that, the server response seems to 
be html:

13:40:33:946 [DEBUG] - Content-length: 30160
13:40:33:946 [DEBUG] - Response read
13:40:33:946 [DEBUG] - response to modification-message:
13:40:33:946 [DEBUG] - <br />
<b>Fatal error</b>:  Call to a member function on a non-object in 
<b>/is/htdocs/44339/horde3/lib/Horde/SyncML/Command/Sync.php</b> on line 
<b>48</b><br />

What do i have to do now?

Regards
Wolfgang