The change you just made has changed the Visual Basic project file, but you have not checked the Visual Basic project out yet.

This error has the following cause and solution:

• You made a change to your Visual Basic project file, but you did not check out the file from the source code control provider first.

  Click Yes to check out the project file so you can save your changes.

  
  

  Click No to keep the project file checked in. You will not be able to save your changes in the source code control provider.