Now if you click on View.. Source.. you can see the actual HTML content of the page. Scroll down to line 752 and you'll be able to see the exact line of code that is causing the problem. Since it mentions char 0 the error is at the very begining of the line. Probably just a syntax error within a block of Javascript.
It's all academic though as, like I say, unless you have admin rights on the site in question, you can't put it right yourself. Your browser can open the page and display it on the screen (complete with the error warning), but you will have no rights to actually change the content. That has to be done by the authors of the page.