variable not defined

I am a novice user and vision impaired. my program required me to fix some items in a list which I was able to do successfully. However, when I clicked on make exe I get variable not defined.

CommonDialog1 is highlighted second line after the equals sign
here's the code sample:


Private Sub mnuHelpContents_Click()
CommonDialog1.HelpFile = CommonDialog1.HelpFile
CommonDialog1.HelpCommand = cdlHelpContents
CommonDialog1.ShowHelp
End Sub

my program has a help button in the menu but doesn't work as windows stopped winhelp from working in windows 10

any ideas? Thanks