Before running the follower, make sure your Roch is setup:
The Roch laptop or Jeston board must be powered on.
The Roch mobile base must be powered on.
The Roch must be placed away from walls and objects that could confuse the follower.
The Roch must not be running any other ros programs.
Reference to Turtlebot's Follower.
To use follower, please take a look to Roch follower tutorial.