The file <filename> could not be mapped to the source code control provider project <project>.

This error has the following cause and solution:

• The source code control provider does not know which source code control provider project to place the file into, or get the file from.

  The source code control provider determines this based on which folder the file is in. Though the source code control provider can map projects to directories within a project/folder subfolder, files in subdirectories or on other drives create problems, unless there already is an association between the folder that the file is coming from and a source code control provider project.

  
  

  Add the specified file to a folder at the same level as, or under, the specified project. If the file is already in the source code control provider, share the file to the current project.