title: Category & Subcategory page redirecting to 404 after installing a module-prestashop 1.6
body: <p>After installing <code>Module PrestaCenter XML Export Free (PS 1.5.x)</code> module to my <strong>presta 1.6</strong> shop i'm unable to visit any category &amp; subcategory pages it shows</p>
  
  <blockquote>
    <p>error 404 page not found &amp; product page says there is 1 error no
    product found.</p>
  </blockquote>
  
  <p>Home shows fine with products.</p>
  
  <p>Please someone help me to find solution.</p>
  
  <p><strong>i'm a beginner, but can go with step by step. any help will be appreciated</strong></p>
  
  <p>I've tried disable enable friendly url,
  checked all urls</p>
  
  <p><code>2017-07-23 13:02:49    Error   162.158.116.90      AH01071: Got error 'PHP message: PHP Fatal error: Call to a member function getValue() on boolean in /var/www/vhosts/server1.buymebrand.com/httpdocs/modules/prestacenterxmlexportfree/classes/PcXmlFreeService.php on line 65\n', referer: http://www.buymebrand.com/editors/index.php?controller=PcXmlFree&amp;token=2f4c14e9566a0ec5ce2a72c5364deb14             Apache error
  2017-07-23 13:03:01 Error   162.158.116.90      AH01071: Got error 'PHP message: PHP Fatal error: Call to a member function getValue() on boolean in /var/www/vhosts/server1.buymebrand.com/httpdocs/modules/prestacenterxmlexportfree/classes/PcXmlFreeService.php on line 65\n', referer: http://www.buymebrand.com/editors/index.php?controller=PcXmlFree&amp;token=2f4c14e9566a0ec5ce2a72c5364deb14             Apache error</code></p>