questions on InitCommonControlsEx

I have had an ongoing problem that rarely occurs on some systems.
The error is runtime 0 and my app does not even start. I have narrowed it down to
InitCommonControlsEx. i have been using code from vbaccelerator.
http://www.vbaccelerator.com/home/vb/code/libraries/xp_visual_styles/using_xp_visual_styles_in_vb/article.asp
InitCommonControlsVB is the first line in sub Main, so it is called before anything else. See code.
I have not been using the line :On Error GoTo 0 and do not understand the "On Error Resume next"
which i never use in any of my code. My app does include the manifest.
I do not understand the usage of On Error resume next, then the On error Goto 0. Can someone explain ? Do i need to include the Comctl32.dll in my setup? I have noticed that this dll is not even on my system, only a Comctl32.ocx

Public Type tagInitCommonControlsEx
   lngSize As Long
   lngICC As Long
End Type
Public Declare Function InitCommonControlsEx Lib "comctl32.dll" (iccex As tagInitCommonControlsEx) As Boolean
Const ICC_USEREX_CLASSES = &H200

Public Function InitCommonControlsVB() As Boolean
    On Error Resume Next
   Dim iccex As tagInitCommonControlsEx
   ' Ensure CC available:
   With iccex
       .lngSize = LenB(iccex)
       .lngICC = ICC_USEREX_CLASSES
   End With
   InitCommonControlsEx iccex
   InitCommonControlsVB = (err.Number = 0)
   On Error GoTo 0
    
    End Function

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