The project file 'item1' contains invalid key 'item2'

This error has the following causes and solutions:

• The Visual Basic project (.vbp) file contains a key that Visual Basic doesn't recognize. The file may be corrupt.

  Install a backup copy of the specified file or modify the file using a text editor to correct the error.

  Warning Modifying a Visual Basic file in an editor other than Visual Basic may corrupt the file. This is recommended only for advanced users.

For additional information, select the item in question and press F1 (in Windows) or HELP (on the Macintosh).