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Problem with leinigen (clojure) using "Clojure for the brave and true"

Hi, I recently started reading "Clojure for the brave and true" and encountered some problems.

First I wasn't able to install leiningen on my win10 system, so I installed it on my only alternative ans RasPi2. It installed Leiningen 1.7.1. on Java 6 (Openjdk). And Ig got the second problem.
When I wanted to create the first project with

lein new app closure-noob (as in the book).

Shere was quite an difference... the core.clj was not in src, but in src/app and the file was not as in the book. It only contained the namespace and nothing more. To I tried to edit the file und wanted to run it with

lein run.

Problem: I got the error message, that project.clj did contain an :main. What can I do now?
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