Unable to open website due to scope application error

You are a bit unclear as to your relationship to the website in question... is it yours?  You make it sound like you're just a visitor.  If it's the latter, the only thing you can do is to contact whoever maintains the site and tell them to fix their code.

If it's your site, then there's a big clue as to what you need to do in the next part of the error message (after the bit you quote):

Before application variables can be used, the application state management system must be enabled using the CFAPPLICATION tag.

That does kinda explain what you need to do.

It would probably be useful to read up on what it's saying, starting with <cfapplication>:

http://help.adobe.com/en_US/ColdFusion/9.0/CFMLRef/WSc3ff6d0ea77859461172e0811cbec22c24-7d69.html

Or perhaps instead Application.cfc:

http://help.adobe.com/en_US/ColdFusion/9.0/Developing/WSc3ff6d0ea77859461172e0811cbec22c24-7d39.html#WSc3ff6d0ea77859461172e0811cbec22c24-68e0

And probably about the CF application framework in general (indeed the latter is a subsection of this):

http://help.adobe.com/en_US/ColdFusion/9.0/Developing/WSc3ff6d0ea77859461172e0811cbec22c24-7e19.html

Also, you should not have robust exception handling switched on on a production server.  Switch it off.

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Adam