Updating from CI 1.7.2 to CI 2.0.0 - class CI_Controller not found

[eluser]peekk[/eluser]
Hello, i;m trying to update my old version of codeigniter platform, and path to my CI is:
/home/user/www/mysite. That's all right, it's written here: http://ellislab.com/codeigniter/user-gui...e_200.html That I should replace my system folder (except application folder) with this from 2.0 (i want to update to 2.0).

I copied these directories from 2.0.0's system folder (that's core, database, fonts, helpers, language, libraries) and replaced them with these from 1.7.2. I've done all other things - and after trying to launch my new version of CI - it shows Fatal error: Class 'CI_Controller' not found in /home/user/sitesystem/application/controllers/ctrl1a.php on line 3.

MY /system/core folder contains file Controller.php and it starts with

Code:

class CI_Controller

- so everything should work fine - what's going on?

[eluser]TWP Marketing[/eluser]
If you have moved the system folder or application folder from their default location, you must change the setting in index.php for $system_folder and $application_folder to match the correct path of the new location.

Since you are not using the current version 2.1.2, be careful. I advise using 2.1.2. Read the User Guide that came with the version you are using and follow the upgrade path which it recommends

[eluser]Unknown[/eluser]

Code:

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