If your project(s) are not under source control, please ensure that all files have read/write permissions. We also recommend ...

If your project(s) are not under source control, please ensure that all files have read/write permissions.  We also recommend that you make a backup by copying all content to another directory before conversion.

If the solution or project is under source control, it will be checked out automatically during the conversion. Be sure that no files are exclusively checked out by other users or the projects that contain those files may not be converted.