Namespace collision

gistfile1.txt

1. Unhandled java.lang.IllegalStateException
   == already refers to: #'clojure.core.logic/== in namespace:
   magic-square.puzzle

                Namespace.java:   88  clojure.lang.Namespace/warnOrFailOnReplace
                Namespace.java:  110  clojure.lang.Namespace/reference
                Namespace.java:  168  clojure.lang.Namespace/refer
                      core.clj: 3920  clojure.core/refer
                   RestFn.java:  410  clojure.lang.RestFn/invoke
                          REPL:    1  magic-square.puzzle/eval6157/loading--auto--
                          REPL:    1  magic-square.puzzle/eval6157
                 Compiler.java: 6703  clojure.lang.Compiler/eval
                 Compiler.java: 6692  clojure.lang.Compiler/eval
                 Compiler.java: 6666  clojure.lang.Compiler/eval
                      core.clj: 2927  clojure.core/eval
                      main.clj:  239  clojure.main/repl/read-eval-print/fn
                      main.clj:  239  clojure.main/repl/read-eval-print
                      main.clj:  257  clojure.main/repl/fn
                      main.clj:  257  clojure.main/repl
                   RestFn.java: 1523  clojure.lang.RestFn/invoke
        interruptible_eval.clj:   67  clojure.tools.nrepl.middleware.interruptible-eval/evaluate/fn
                      AFn.java:  152  clojure.lang.AFn/applyToHelper
                      AFn.java:  144  clojure.lang.AFn/applyTo
                      core.clj:  624  clojure.core/apply
                      core.clj: 1862  clojure.core/with-bindings*
                   RestFn.java:  425  clojure.lang.RestFn/invoke
        interruptible_eval.clj:   51  clojure.tools.nrepl.middleware.interruptible-eval/evaluate
        interruptible_eval.clj:  183  clojure.tools.nrepl.middleware.interruptible-eval/interruptible-eval/fn/fn
        interruptible_eval.clj:  152  clojure.tools.nrepl.middleware.interruptible-eval/run-next/fn
                      AFn.java:   22  clojure.lang.AFn/run
       ThreadPoolExecutor.java: 1145  java.util.concurrent.ThreadPoolExecutor/runWorker
       ThreadPoolExecutor.java:  615  java.util.concurrent.ThreadPoolExecutor$Worker/run
                   Thread.java:  745  java.lang.Thread/run