a Fatal error: Call to undefined function field_attach_load()

a Fatal error: Call to undefined function field_attach_load() in /hsphere/local/home/puretech/puretech.tv/irclass/test/includes/entity.inc on line 316

http://puretech.tv/irclass/test/install.php?profile=standard&locale=en

Have got this error second time.

First time I have delete database and created new one. Then I have started installation again but getting same problem. I have tried all steps given in different threads for same issue but not getting success.

Please help me.