Prespawn permission denied on Passenger start

gistfile1.bash

$ passenger start

=============== Phusion Passenger Standalone web server started ===============
PID file: /home/matteo/code/prova/tmp/pids/passenger.3000.pid
Log file: /home/matteo/code/prova/log/passenger.3000.log
Environment: development
Accessible via: http://0.0.0.0:3000/

You can stop Phusion Passenger Standalone by pressing Ctrl-C.
===============================================================================
Cannot execute '/home/matteo/.passenger/standalone/3.0.7-x86-ruby1.9.2-linux-gcc4.5.2-1002/support/helper-scripts/prespawn http://0.0.0.0:3000': Permission denied (13)


# You can simply solve it by chmodding the helper-scripts folder as follow
chmod a+x /home/matteo/.passenger/standalone/3.0.7-x86-ruby1.9.2-linux-gcc4.5.2-1002/support/helper-scripts/*