The project file 'item1' contains invalid key 'item2'. The project can't be loaded

Visual Basic did not recognize the specified key in the .VBP file. This error has the following cause and solution:

• The .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 only recommended for advanced users.