System.InvalidOperationException:“Operation is not valid due to the current state of the object.”

[scx1125]

System.InvalidOperationException:“Operation is not valid due to the current state of the object.”
CurrentWindow.Activate();
ContextMenuItem menu = new ContextMenuItem
{
Title = "Open UF.Client Here",
AcceptDirectory = true,
Exe = "UF.Client.exe",
Param = "{path}"
};
await new ContextMenuService().SaveAsync(menu);

[ghost1372]

Can you give me a example repro project?