Sync Problems with two zotero libraries

I have two zotero libraries and try to sync them using my uni web storage(it happened like that). I have setup a sync with my uni webdav server (secure) and I could see the files appear in the folder there. But when I try to merge my libraries from either computer (uni computer and my laptop), it is not happening. I get the sync button triangle saying 'Empty response from the server'. I don't know what is the problem. To mention, I am using the trunk build (3455).

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