Hi,
So it says that the error is on line 149 in my tests, and that's this line:
<g:description><![CDATA[ Armarios modulares 19”, anchura 600mm. Para instalaciones de cableado, telecomunicaciones, IT y electrónica industrial. Diseñados según normas IEC 60 297-2, DIN 41494 partes 1 y 7, ANSI/EIA-310 y UNE 20 539-2.
I see however that STX control character in the description of that product:
take.ms/rhk9Y
I tried to remove these characters in your products descriptions and it removes the issue. So the problem is in the description of your products. Make sure that you don't have that character in them.