Hi Alex,
i had a look at your site, the problem is that some images have an 'alt' attribute containing invalid escaped characters.
For example:
| Code: |
<img src="http://cdn1.quebecguitare.ca/media/k2/items/cache/9063df0b1b4d9d96fd7fea653ac618e5_M.jpg" alt="Cours de Guitare Country Rock Montréal" style="width:740px; height:auto;" />
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in a valid XML document the entity é is not valid.
You should correct the titles for images that includes invalid XML entities.
Right clicking on this page
http://www.quebecguitare.ca/component/jmap/sitemap/images
you can choose to open source code and locate images to fix.
Best regards
John