Prestashop mod_rewrite not working ? getting "Undefined index" and "Trying to get property of non-object" php e

Hi, I'm trying to make a Prestashop migration and all went more or less okay, but I'm having issues with mod_rewrite (system is saying that is not enabled) and also some PHP errors like this:

Code:

Notice: Undefined index: category in /home/nginx/domains/domain.es/public/tools/smarty/sysplugins/smarty_internal_templatebase.php(157) : eval()'d code on line 223

Notice: Trying to get property of non-object in /home/nginx/domains/domain.es/public/tools/smarty/sysplugins/smarty_internal_templatebase.php(157) : eval()'d code on line 223

Notice: Trying to get property of non-object in /home/nginx/domains/domain.es/public/tools/smarty/sysplugins/smarty_internal_templatebase.php(157) : eval()'d code on line 223

Notice: Undefined index: category in /home/nginx/domains/domain.es/public/tools/smarty/sysplugins/smarty_internal_templatebase.php(157) : eval()'d code on line 223

Notice: Trying to get property of non-object in /home/nginx/domains/domain.es/public/tools/smarty/sysplugins/smarty_internal_templatebase.php(157) : eval()'d code on line 223

Notice: Trying to get property of non-object in /home/nginx/domains/domain.es/public/tools/smarty/sysplugins/smarty_internal_templatebase.php(157) : eval()'d code on line 223

Of course redirs and most of rewritten links are not working.

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Any tip ? thanks !