JavaScript error while loading WA eCart 01 Session.htm

Haven't been anywhere near the LED website we developed recently because we are terrified of yet further problems with the eCart extension but, today, we were asked to change a postage rule and make an edit to the shopping basket page. Changes to the postage rules seem to have been successful however upon simply opening the shopping basket page, and no surprise to us at all, we are faced with an unusual error message relating specifically to eCart:

JavaScript error while loading WA eCart 01 Session.htm:

At line 1298 of file
"C:\Users|Nathon|AppData|Roaming\Adobe\Dreamweaver CC 2014\en_US\Configuration\Shared\Controls\Scripts\WATrigger.js":}
missing } in compound statement

I would love to be able to use eCart just for a day without something like this happening but time and again we're faced with problems like this.
I would appreciate clarification on what this is and a resolution that doesn't involve wiping all our settings.

Thank you.
NJ