PhP Error Message on Installing OpenScholar Version: 20.Beta14: /profiles/openscholar/openscholar.profile on line 497

PhP Error Message on Installing OpenScholar Version: 20.Beta14: openscholar.profile on line 497

Hello,

During installing this version on the shared hosting server, we just increased memory limit in settings.php file, and have not touched any file in this application. Now, the memory limit is solved. When we are at this install step: "OpenScholar flavor", any selection always gave us the blank Web page and the following Error Message:
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PHP Fatal error: Call to undefined function os_include() in /.........../openScholar/SCHOLAR-2-0-BETA14/profiles/openscholar/openscholar.profile on line 497
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*We have tried the solutions suggested in the following web pages, but none of them have fixed the above issue:
http://drupal.org/node/1350462
http://forum.civicrm.org/index.php?topic=17481.0
http://ftp.drupal.org/files/videocasts/Install-D6.mp4
http://groups.drupal.org/node/104979
http://drupal.org/documentation/install/beginners
http://drupal.org/server-permissions
http://drupal.org/documentation/install/beginners
http://groups.drupal.org/node/201128

Any other people have the same experience? Any suggestions will be appreciated.