Error in Product Categories (virtuemart)

Hi, I have a category mistake to create a new, or edit a product already created an example. I enclose the page I get the access. Why can this be? What am I doing wrong? I await your response. thanks

Al final de la página pone este error:
Warning: Invalid argument supplied for foreach() in /homepages/33/d400318538/htdocs/administrator/components/com_virtuemart/views/category/tmpl/default.php on line 75
# Category Name Description Products Published Ordering

Fatal error: Call to a member function getListFooter() on a non-object in /homepages/33/d400318538/htdocs/administrator/components/com_virtuemart/views/category/tmpl/default.php on line 140

What is Joomla version?

Joomla 2.5

VirtueMart 2 component is not 100% compatible with Joomla 2.5 yet. We are waiting for VM version 2.0.1 to fix VM category errors. Until then, please use Joomla 1.7 version.

ok, I did not know this ...And I can make that change without affecting what I have already installed? as I can do not to lose the settings that I have made​​?

THANKS FOR YOUR QUICK REPLY

Unfortunately, you must install HotStart for Joomla 1.7 again and you will lose your data. New version of VM could be available soon, but it depends of VirtueMart development team: www.virtuemart.net