Fatal error: require_once() [function.require]: Failed opening required '/home/teamcvtz/public_html/includes/cache.inc' (include_path='.:/usr/local/altphp/lib/php') in /home/teamcvtz/public_html/includes/bootstrap.inc on line 2280

Hi,

After making lots of effort I got the solution for this issue.

This is very general issue of Drupal as i found that many people has raised this issue and nobody has got the proper solution for this.
It is the issue related to drupal bootstrap processing issue.
To resolve this issue go to the includes/database/database.inc file and add code to the top of the file and close this complete page code in that condition.

if (!class_exists('insertquery_mysql')) {

complete file code

}

Double loading of object will be prevented by this code.