SDL GROUPSHARE FILE ACCESS ERROR

Hello! We published a project to our Groupshare server. It contains about 100 files. All files were assigned to the same translator. The translator was able to log in and check out the first file, but she is not able to download any other file in the project. She is getting the following error message:

"[FILE] could not be found locally and the server is not available to download it. Connect to the server to get the latest version of the file."

All files are assigned to her, and the server IS available.

We publish with Trados Studio 2017 and Groupshare 2017.