UserInteractionLevels is undefined

Hello All,

While exporting Indesign INDD file to INX file on CS3 Server using javascript (.jsx) I got following error...

Error Number: 2
Error String: UserInteractionLevels is undefined
Line: 12
Source:         app.scriptPreferences.userInteractionLevel = UserInteractionLevels.neverInteract;

Can you please suggest how to resolve this issue?

Thanks,

Shail