XML Error

I have prestashop 1.5.3 installed but I get the following error calling my side www.baratisimo.com.co
Error de lectura XML: times formado
Ubicación: http://www.baratisimo.com.co/index.php
Numero de línea 52, Column section 116:

this problem is a server problem or or what can I do?

Just turn off “speed optimisation (beta)” in domain settings/edit. I had the same problem with prestashop, solved it this way.
Best, Lin