symfony-cmf/symfony-cmf-docs — pull request #43 by zuhair-naqvi (2012-11-22 04:40:53+00:00)
Title: Fixed RouteNotFoundException in admin dashboard

Comparing the routing file with cmf-sandbox routing file I realised that it was missing:

_sonata_admin:
resource: .
type: sonata_admin
prefix: /admin

Adding the above config fixes this issue.