I created a sub-site correctly, but when i will make the installation por the new sub site. I obtain a white page. It is caused by a fatal php error:

Fatal error: Class 'JControllerLegacy' not found in /var/www/tecnofor/installation/controller.php on line 19 Call Stack: 0.0209 682696 1. {main}() /var/www/tecnofor/installation/index.php:0 0.2057 4838280 2. JInstallation->render() /var/www/tecnofor/installation/index.php:85 0.2276 5818184 3. require_once('/var/www/tecnofor/installation/controller.php') /var/www/tecnofor/installation/includes/application.php:76

My joomla version is 2.5.3...

can someone help me ?

White page as you can read several times in this forum is related to a PHP fatal error.

JMS is bundled with the latest joomla "installation" directory that use the latest joomla PHP code.

Here, you mentioned that you are using a Joomla 2.5.3.
Therefore, we suggest you that you restore the "/installation" directory from your joomla 2.5.3 package.

When the joomla 2.5.3 installation directory is restored, go in JMS and re-install the patches to let patch this 2.5.3 installation directory.