Strict Standards: Redefining already defined constructor for class Net_URL in /home/alojamen/public_html/administrator/components/com_sef/sef.class.php on line 643

Error: headers already sent in sef.class.php on line 643.
Stopped at line 906 in joomsef.php: HEADERS ALREADY SENT (200)
URL=http://www.alojamentopt.com/index.php?option=com_sobi2&catid=5&sobi2Id=874&sobi2Task=sobi2Details&Itemid=27:
OPTION=com_sobi2: