Problem up grade to 2.5.7

Hello,
I just spent the site has 2.5.7 and 2.5.6 I get errors on several pages
Here is the site in question:
http://saveursetbulles.etudesgamma.com
do not put www.
thank you for your help

You should configure your server according to Joomla requirements so disable display_errors option in PHP configuration and turn off this debug mode. Then in template panel under advanced settings choose head area for columns width instead of style tags.

What do you mean it does not understand that:
Then in template panel under advanced settings choose head area width for columns INSTEAD of style tags.

What do you mean it does not understand that:
Then in template panel under advanced settings choose head area width for columns INSTEAD of style tags.

Please look at this image https://www.gavick.com/documentation/wp-content/uploads/2012/03/prefixfree.png

and choose 'style tags' in columns width position option.