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I also had this problem. What I basically did was a modification on the launching of the node ps3joy, changing it for the ps3.launch included in the launch folder of package ps3joy. Here is the launch file which worked for me:

> <launch>
> 
>  <!-- Turtlesim Node-->   <node
> pkg="turtlesim" type="turtlesim_node"
> name="sim"/>
> 
> 
>  <!-- PS3 joy node -->   <node
> pkg="joy" type="joy_node"
> name="ps3_joy" output="screen" >
>     <param name="dev" type="string" value="/dev/input/js0"
/>
>     <param name="deadzone" value="0.12" />   </node>
> 
>  <!-- Axes -->   <param
> name="axis_linear" value="1"
> type="int"/>   <param
> name="axis_angular" value="0"
> type="int"/>   <param
> name="scale_linear" value="2"
> type="double"/>   <param
> name="scale_angular" value="2"
> type="double"/>
> 
>   <node pkg="learning_ps3joy"
> type="turtle_teleop_ps3joy"
> name="teleop"/>
> 
> </launch>

If you are naming the files and folders as is shown in the tutorial it should work.