Fatal error: "Class JController" not found in Joomla - joomla

I'm trying to update the Joomla version on one of the website I managed.
I downloaded the package to upgrade to Joomla 1.5.25 (if my memory's good). I did a test on a dev website and everything worked well.
Now, when I apply the update to the current website, i receive the error : Fatal error: "Class JController" not found in */components/com_content/controller.php "
The line
jimport('joomla.application.component.controller');
is there.
Anyone has any idea?
Thanks a lot

try to upload the files again via FTP client. Sometimes files don't transfer properly or at all. Also make sure you downloaded the correct upgrade package related to your previous version.

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You mention the installation was cancelled - try uninstall the extension from the extension manager and then re-install it successfully?
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Thank you.
I was stuck on this since morning and finally got the solution. This might be of help...
The component name was com_ABCdef and it worked on local like that however when I installed in to site it became all small letters and was calling for option=com_abcdef and my installation files file ABCdef.xml and ABCdef.php and changing those to lower case solved my problem.
how are you doing it ?
Do you have the xml install file ?
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have you placed it in the component directory ?
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Please try reinstalling the package "Mage_All_Latest" with the Magento Connect Manager and make sure, you have set the folder-permissions right.
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It sounds like there was a problem while your install, so a reinstall of the latest packages maybe solves your problem.

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