This message has the following cause and solution:
When you add a Microsoft Access database to or create one from a source code control project, the source code control provider tries to delete the temporary working folder and all files in it. Ensure that you do not have a command prompt with its current folder set to the working folder, or a running executable in the folder. Also make sure that your network is functioning properly.
The working folder is for the exclusive use of the source code control provider. Do not try to store any files in this folder or otherwise access this folder.