ener.hlp (Topic list)
Method not applicable for this object (ERR: 421)
■ You tried to use a method that is not available for use
  with the specified object. For example, the following
  produces this error because the ADDITEM method is used only
  with a list or combo box control:
 
              Command1.ADDITEM
 
■ Possible solutions:
 
  • Check the method's topic in Help for a list of applicable
    controls and change the reference as required.
 
  • Check the object's topic in Help for a list of applicable
    methods and change the reference as required.
 
■ If you need additional help, move the cursor to a keyword
  and press F1 to open the Help window.