Why is this Symfony annotation not working?

Before I start, I should mention that this is&nbsp;<strong>Symfony 2.8.25</strong>. (I just started working on this code base, and once we get some critical issues resolved, we'll be upgrading.)

What is Symfony? Features and applications

**Symfony is a PHP framework** whose work in building and maintaining web applications works very quickly and turns into recurring coding tasks. There are some prerequisites to start it in your computer-Such as - Linux, FreeBSD, Mac OS or...