Magento Error Fatal error: Call to undefined method Mage_Catalog_Model_Resource_Category_Flat::loadAllAttributes(), speed up admin page and magento products' and categories pages

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Hello!! I can fix the error into an existing website as per your need. I am ready to start working on your project IMMEDIATELY. Here, I would like to discuss about this project in more detail manner to proceed further. Awaiting your positive response. Thank You Best Regards Akira

Hello I am specialists having 7+ year in design custom Magento theme & Magento custom module development. I am working on both version 1.x to 2.x The services which are available for migration from legacy shopping cart system to Magento through my custom Magento extension development experienced . In Server side i can done following point. • Application Installation and Configuration (Ex. Apache, MySQL,PHP) • Firewall Setup and Configuration • SSL Services • Initial Server Configuration, Security Audit and Optimization • Backing up your data • Monitoring services and Server Security. • Shell Scripting (Bash). • Mail Services ( Exim,Sendmail, Postfix) • Git Version Control System • AWS EC2 Setup • Free or Paid Cpanel installation setup • Performance Tuning of Sites • CMS Setup like Magento, Joomla, Wordpress, Drupal, Opencart • Redis,Varnish, Pagespeed, Apache, Mysql Tuning. • Working on different hosting providers like Godaddy,rackspace, OVH, Linode,AWS and more • Nagios Server monitoring • Antivirus clamav, rootkit, malware detection(maldet) and ip based firewall using csf,ufw. • Installation and Configuration of XenServer and VmWare Esxi for VPS Setup. • Setup php-fpm , Nginx for used as web proxy for faster access web data. • Configuring Tripwire for monitoring files. • Mysql Server Tuning • OpenFire Chat System Setup for an Organization Would be glad working with you. Thanks