Description
As reported on Symfony Docs (symfony/symfony-docs#9867):

I created a new Symfony project and added Twig. I also added an external Bundle that use the syntax FooBarBundle::template.html.twig and I got this exception:

Unable to find template "FooBarBundle::template.html.twig" (looked into: /srv/templates, /srv/templates).

Possible Solution
If the not found template contains : and symfony/templating is not installed, display a different error message explaining the user that they must install symfony/templating.