Topic: FCGI-File is not interpreted

I want to start a Railsapplication on my webspace.
I think my .htaccess File is correct.
When i browse to my url /blabla/test then it redirects me to /blabla/test/public/dispatch.fcgi

But the fcgi File is not interpreted. It is shown like a textfile.
The content of my dispatch.fcgi is only this:

#!usr/bin/ruby


Is this correct?
What is my mistake?
How can i start my application?