Sorry, there was a problem syncing your library: Missing required field: Text. Error ID: ki_4ZGoNASM

Hy, I need some help... I have Mendeley Desktop and the version for Android too. In my Mendeley Desktop there is always the error message: Sorry, there was a problem syncing your library: Missing required field: Text. Error ID: ki_4ZGoNASM. And, sometimes, when I tried read some papers in my tablet (Android) some files can't be read (there isn't the blue book symbol). I don't know what is de "missing requiered field"... Tks!