Can't execute any of what's show on page 68-69 of your book

[sb3rg]

I updated the dependencies my project.clj file, ran lein deps. I checked that it's in my ~/.m2/repository/ folder.

I tried requiring the project in the repl in multiple ways
(require '[com.backtype.def-datastores :as dfs])
(require '[com.backtype.def-datastores.hadoop :as hadoop])
(require '[com.backtype.def-datastores.hadoop.pail :as pail])

I keep getting this type of error:

Execution error (FileNotFoundException) at big-data.core/eval1560 (form-init14664829471889604774.clj:1).
Could not locate com/backtype/def_datastores__init.class, com/backtype/def_datastores.clj or com/backtype/def_datastores.cljc on classpath. Please check that namespaces with dashes use underscores in the Clojure file name.

What am I missing here?

[sb3rg]

correction that should read:
(require '[com.backtype.dfs-datastores :as dfs])