This may be a little technical for many users, and really only applies to those connecting from home. If you are working remotely and accessing the BIM Server from a computer outside the office you may get a warning occasionally that says “Unknown Document Version (0,0)“.
This happens for a few reasons, one common one is a file corruption. In the case of a remote connection it is most likely due to a rift in the status of the model on the BIM server and the content of your local data. To access the file remotely when this warning comes up go to your Team Work Drop Down > Project > Local Data Manager. When in this dialog box select the file you are having trouble accessing and delete it from the local data.
As a warning, this will delete any unsent changes. To prevent the warning in the first place all you need to do is send and receive changes when you are done working remotely, at the end of every day, and leave the project (Teamwork > Project > Leave Teamwork Project).