An unhandled exception of type System.ComponentModel.Win32Exception occurred in FlaUI.Core.dll

Question

I am trying some windows application automation using flaUi automation. here I tried to click on menu in an application which supposed to load form before perform any further action.

Code:

 var menu = mainwindow.Automation.GetDesktop().FindFirstDescendant(cf.Menu()).AsMenuItem();
 menu.Items["Report"].Items["CR Reports"].Items["Bk Report"].Invoke();

It throws error on second line of code.

This works fine on one system and same code throwing an:

unhandled exception of type system.componentmodel.Win32Exception occurred in flaui.core.dll exception

on another.

Any help would be greatly appreciated!!