diff --git a/src/propeller/problems/PSB2/camel_case.cljc b/src/propeller/problems/PSB2/camel_case.cljc
index 542b62e..6fa9904 100644
--- a/src/propeller/problems/PSB2/camel_case.cljc
+++ b/src/propeller/problems/PSB2/camel_case.cljc
@@ -6,7 +6,8 @@
             [propeller.push.utils.helpers :refer [get-stack-instructions]]
             [propeller.push.state :as state]
             [propeller.tools.math :as math]
-            [propeller.tools.metrics :as metrics]))
+            [propeller.tools.metrics :as metrics]
+            [psb2.core :as psb2]))
 
 ; ===========  PROBLEM DESCRIPTION  =====================================
 ; CAMEL CASE from PSB2
@@ -18,6 +19,8 @@
 ; Source: https://arxiv.org/pdf/2106.06086.pdf
 ; =======================================================================
 
+(def train-and-test-data (psb2/fetch-examples "data" "camel-case" 200 2000))
+
 ; Visible character ERC
 (defn random-char
   []
@@ -63,11 +66,8 @@
 
 
 (defn error-function
-  ([argmap individual]
-   (error-function argmap individual :train))
-  ([argmap individual subset]
+  ([argmap data individual]
    (let [program (genome/plushy->push (:plushy individual) argmap)
-         data (get (get argmap :train-and-test-data) subset)
          inputs (map (fn [i] (get i :input1)) data)
          correct-outputs (map (fn [i] (get i :output1)) data)
          outputs (map (fn [input]
@@ -95,4 +95,8 @@
        :total-error #?(:clj  (apply +' errors)
                        :cljs (apply + errors))))))
 
-
+(def arglist
+  {:instructions   instructions
+   :error-function error-function
+   :training-data  (:train train-and-test-data)
+   :testing-data   (:test train-and-test-data)})