How come I can not activate my Virtual Python Environment with 'source env/bin/activate' command?

Programmer Question

I am trying to activate my Virtual Python Environment to use with Pylons but I think I am executing the commands wrong.

jem@jem-laptop:~$ source env/bin/activate
bash: env/bin/activate: No such file or directory

What am I doing wrong?
How should I do it right?

Find the answer here