CSS and XHTML validation conflict

When I use CSS validator to check 

http://www.telfordsteamrailway.co.uk/stove/index.shtml

I get  

Please, validate your XML document first!

Line 47

Column 51

Element type "a" must be followed by either attribute specifications, ">" or
"/>". 

 When I use the HTML validator I get "Valid page"

 

Which is correct?

 

Allan Smith