Piwik upgrade error in "Visitor's in real time" section

Hi everyone,

I have just upgraded to piwik 2.0.2 and I have an error message (or two ?) appearing on the index page, in the “Visitor’s in real time” section.
I made a print screen.
I tryed to search on the forum, but found nothing. And I would like to precise that I am a php/sql total noob… ^^

Someone have an idea ?
Thank you very much for your help,

Reupload all files from 2.0.2 as some files are not uploaded correctly.

It works perfectly. I didn’t thought the problem could be solved with this easy way…

Thank you very very much !