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I tried removing them from the desktop but they get removed from the cloud as well.
Adobe Support should be your first contact with these issue, this is not a support forum as such and support staff no not monitor this forum regularly.
Can I suggest you read some of the links below, sometimes filename or file size can cause the message you are seeing, if not please contact Adobe Support as your next step.
-Size Limits https://forums.adobe.com/thread/1488242
-sync and email link http://forums.adobe.com/thread/1427516?tstart=0
-Phantom folder problem https://forums.adobe.com/thread/1490445