This error has occurred in trados 2014 sp2, 2015 trial version and 2017 trial version for many times when i add new files to an existing project while many translators sharing the same project on another computer do not have the same problem. Now i cannot open the same project nor can they see the files added by me in the project while actually the added  sdlxliff files are in the project folder. is this problem caused due to file number? I tried to repair and reinstall trados, i succed to add the project to the list, but when i double click the project in the trados, trados crashed. I try to use all the original files to create a new project and the project went fine.