Problems to setting environment variable

[RaulManus]

Hi, I have some doubts when i create the symlink and setting the environment variable.
First i create the symlink pointing to my context (mooc)

ln -s context/mooc links/mooc

Then exec

APP_CONTEXT=mooc symfony proxy:domain:attach mooc --dir=links/mooc
APP_CONTEXT=mooc symfony server:start --dir=links/mooc

But i get an error
[Web Server ] Aug 16 12:22:55 |WARN | HTTP unable to detect the front controller, disabling the PHP server error="Passthru script \"/index.php\" does not exist under /home/courses/ddd-in-php/links/mooc/: stat /home/courses/ddd-in- php/links/mooc/index.php: no such file or directory"
I think I'm making a mistake in creating the symlink. Someone can tell me where is the error?

Thanks!