Cross Browser Testing - Firefox Exception

[vikramg]

HI,
I had a recording completed in IE for a scenario.
I ensured Firefox add-on activated using the Instrumentation Wizard .
Also, Firefox > Add Ons > Extensions has the Ranorex Automation enabled.

With the above setup, when tried execution encountered an exception:

REfer attached the screen grab.
Let me know how to proceed from here.

[vikramg]

To add, im using
Ranorex Version 3.3.1.18438
.NET Runtime version 2.0.50727.3603

The above details from the tool Help > About dialog.