Problem launching moveit_setup_assistant in groovy

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I have installed moveit on groovy (Ubuntu 12.04) and I want to follow their tutorials. The first step is to launch the moveit_setup_assistant and I failed in the this very first step. When I run this command (suggested by moveit Wiki)

roslaunch moveit_setup_assistant setup_assistant.launch

I receive this error:

[moveit_setup_assistant] is not a package or launch file name

Why this happens and how should I tackle this problem? It might be worth mentioning that while typing the command, tab complition works properly and completes both parts.