As seen in the title I am getting an error from .NET Frameworking after the program has started and it automatically loads the res.
I am using Win 11
Here is the error txt:

See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.NullReferenceException: Object reference not set to an instance of an object.
at Tank_Exporter.frmMain.store_in_treeview(Int32 i, TreeView& tn)
at Tank_Exporter.frmMain.load_tabs()
at Tank_Exporter.frmMain.frmMain_Load(Object sender, EventArgs e)
at System.EventHandler.Invoke(Object sender, EventArgs e)
at System.Windows.Forms.Form.OnLoad(EventArgs e)
at System.Windows.Forms.Form.OnCreateControl()
at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible)
at System.Windows.Forms.Control.CreateControl()
at System.Windows.Forms.Control.WmShowWindow(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
at System.Windows.Forms.ContainerControl.WndProc(Message& m)
at System.Windows.Forms.Form.WmShowWindow(Message& m)
at System.Windows.Forms.Form.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

Hi
This line
System.NullReferenceException: Object reference not set to an instance of an object. at Tank_Exporter.frmMain.store_in_treeview(Int32 i, TreeView& tn)
is telling us that tn (tree node) does not contain a valid tree node.
Update the game if you have not. Its possible the data from the wot server isn't found in the game data.
If that doesn't work, or does... let me know, okay?

Yes,
I didn't update WoT for a while.
Thanks, that resolved the issue.