Error related with TF tree

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I'm trying to localize a Pioneer P3dx with AMCL.

Whenever i run

rosrun amcl amcl

the node says that no data is being published in /scan. I've searched for it and people usually say that there need to be a transform from the odom frame to the laser frame (at least it was what I understood).

I've made a statical transform and when i run rqt_tf_tree I got /odom->/base_link->/base_laser. Ain't this the necessary? Because with this configuration i still cannot run AMCL correctly.

Any hints?