My Syncing Can't Work Completely

I have just replaced my personal computer from windows to MacBook Air with OS X El Capitan. So when I have installed zotero in that new device, hoping to see all my collections which contain more or less 1800 files of PDF to move properly from my old windows laptop. But unfortunately, after days of syncing attempt, I still can not receive completely all the PDFs or in other words, I could not open many of the PDFs though many of those files appeared in the library as if they were there.
Please tell me what's really the problem which cause the syncing can not work completely to move all the PDFs into my the zotero library in my new device.
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