Update WP & plugins : fatal error

Hy evrybody,

I have seen there were a WP update available on my admin page so I updated and then also did it for the plugins and extensions.
And then I got this message :

Since then I cannot acces anymore to the admin of my page, whereas the blog is still on line and accessible from the web.

I am not a programm, is anybody can help ?

Thanks a lot guys, you are saving me (:-)

Fatal error: Uncaught exception ‘FileOperationException’ with message ‘/homez.157/transverx/www/blog/wp-content/w3tc-config/master.php could not be created, please run following command:

• <strong style=”color: #f00;”>chmod 777 /homez.157/transverx/www/blog/wp-content/cache/tmp
• <strong style=”color: #f00;”>chmod 777 /homez.157/transverx/www/blog/wp-content/w3tc-config

‘ in /homez.157/transverx/www/blog/wp-content/plugins/w3-total-cache/inc/functions/activation.php:127 Stack trace: #0 /homez.157/transverx/www/blog/wp-content/plugins/w3-total-cache/lib/W3/ConfigWriter.php(159): w3_throw_on_write_error(‘/homez.157/tran…’, Array) #1 /homez.157/transverx/www/blog/wp-content/plugins/w3-total-cache/lib/W3/Config.php(71): W3_ConfigWriter->save() #2 /homez.157/transverx/www/blog/wp-content/plugins/w3-total-cache/lib/W3/CloudFlare.php(174): W3_Config->save() #3 /homez.157/transverx/www/blog/wp-content/plugins/w3-total-cache/lib/W3/Plugin/CloudFlare.php(52): W3_CloudFlare-> in /homez.157/transverx/www/blog/wp-content/plugins/w3-total-cache/inc/functions/activation.php on line 127