Sitemap problem

Google has come back with any error on one of my sitemaps.

<loc>http://www.double-glazing-bac.co.uk/product_range.asp?id=8&level1id=2&level2id=4</loc>
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I can not see any problem with this line.
Can anyone advise me on what's wrong.

Can you use CDATA to get around this?

 

Try converting & to &amp;

 

I'll give it a go and let you know

 

Sometimes Google reports errors, then you log in the next day, there is no error.

 

it's good solution but the best one is using sef urls.

using sef urls is also will help him to get a better serp position