[FLOW3-general] FLOW3 installation , setfilepermission error

[Karsten]

Hi,

I try to set file permissions for my FLOW3 installation.
I type in terminal:

./flow3 core:setfilepermissions john www-data www-data

then i become an error message like this: 

"/usr/bin/env : php: Datei oder Verzeichnis nicht gefunden"

I have replace john with my username and i’m in the FLOW3 directory.

My System:
Ubuntu 11.4
Xampp 1.7.4 for Linux with Apache 2.2.17, MySQL 5.5.8, PHP 5.3.5

Anybody an idea?

Greetings,
Karsten