Undo and Redo stuffs

Hello interwebs, my Undo/Redo command does not want to work.

I have fixed everything up until the point where it says: "Compile Error: Method or data member not found" and points to here:

Private Sub timUnRe_Timer()
Undo.This-->AddUndo<--Function lstUndo.Text
timUnRe.Interval = 0
End Sub

I have put it in a module called modNPM and "AddUndo" is a Public Sub.

Help please, I don't know why it can't be found. Thanks for now.