Magento – Enhanced Grid Error in configuration space

Under a Magento 1.5.1.0 Version, it announced today the following error, if one system to > Configuration > TBT CORP EXTENSIONS > Enhanced Product Grid klickte: Fatal error: Call to undefined method Mage_Eav_Model_Mysql4_Entity_Attribute_Collection::addVisibleFilter() in /home/[IhreSeite]/public_html/app/code/community/TBT/Enhancedgrid/Model/System/Config/Source/Columns/Show.php on line 10 After some investigating then the solution was as follows: In the file show.php in the folder app / code /