Fatal error: Cannot redeclare ModelCatalogProduct:

Hi every body, I need your help.

I don´t know why but This happens sometimes.. so many times
After login as admin to get into my backoffice, a lot of times happens this,, blank page with:

Fatal error: Cannot redeclare ModelCatalogProduct::editList() in /home/ajojavi/public_html/www.fluid-house.com/ocart/vqmod/vqcache ... roduct.php on line 164

If I try to get directly for instance , to payment method because the link is save in the browser... after log in again, I appears in this area of my back office, I tray to get products or Panel control... and happen the problem again.

I have Opencart 1.5.6. and some modules, but It seems not be relationated with modules, because its happen to me since I install Vqmod, but sometimes it works and sometimes doesn´t, I quite anoying..

I think that something is wrong with the index of the admin panel, the Control Panel main page

Best regards

That error means you've installed something that is trying to add another editList() function to the specified file. Since it's referencing a vQmod file, it's likely due to a vQmod (though not necessarily, if that file was manually edited). Start disabling your modifications one-by-one until you find the one that did it.

Hi, I fixed the issue...
I don´t use the filters on the products, categories,,,, I have removed from the Vqmod/xml/ the one about filter.xml , and problem has disappeared.
I am not sure if this file comes with the vqmod original or comes with any module.

Thanks to everybody.