The folder you chose is not a valid binding root for the projects you have selected. You attempted to retarget a solution ...

The folder you chose is not a valid binding root for the projects you have selected. You attempted to retarget a solution to a source control folder that is not within the solution's root. In the change source control dialog box, specify the root for the solution. Select the folder %1 levels higher in the tree to change the source control bindings correctly.