Problem with an OPC client in VBA

Hello i'm trying too make a client in vba and I have run into some problems.

I'm using a treeview and a listview. In the treeview comes my server hierarchy while the listview show the individual items. After i click on a node in the treeview the underlying items should appear in the listview. I have got this working for 2 a 3 times after that i get an error that the item(s) can't be found. I don't understand what the problem is and I hope someone can help me with this.

I have attached my program in excel

greetings dadio25
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