Got Fatal error CodeIgniter CI_Controller not found

Question

I got following error on every controller

Fatal error: Class 'CI_Controller' not found in /<path>/system/core/CodeIgniter.php on line 233

The root folder has also its same separate codeigniter system (all ci structure) folder. the site in root in working but when i copy the another ci structure in sub folder i got mentioned fatal error. please help me.

Answer 1

Check your database config in application/config/database.php it's one of the major time consuming error message I faced with CI. Because the error message was simply misleading. So, check the DB config first.