ener.hlp (Topic list)
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Must specify index for object array (ERR: 344)
■ The control referenced is part of a control array. Refer
  to it using this syntax:
 
              ctlname(index).Index
 
  where ctlname is the name of the control and index is the
  value of the control's Index property.
 
■ If you created the control at design time, you can
  determine the index of the control by selecting it and
  viewing its Index property on the Properties bar.
 
■ Possible solution:
 
  • Include the control array specification in the object
    reference.
 
■ If you need additional help, move the cursor to a keyword
  and press F1 to open the Help window.