sqrt-multimethod-error

ERROR in (complex-sqrt) (run-test1287913765739465401.clj:44)
Uncaught exception, not in assertion.
expected: nil
  actual: java.lang.IllegalArgumentException: No method in multimethod 'sqrt' for dispatch value: :clojure.contrib.complex-numbers/complex
 at clojure.lang.MultiFn.getFn (MultiFn.java:115)
    clojure.lang.MultiFn.invoke (MultiFn.java:157)
    clojure.contrib.test_complex_numbers/fn (test_complex_numbers.clj:291)
    clojure.test$test_var__6824$fn__6825.invoke (test.clj:644)
    clojure.test/test_var (test.clj:644)
    clojure.test$test_all_vars__6829$fn__6830$fn__6837.invoke (test.clj:659)
    clojure.test/default_fixture (test.clj:617)
    clojure.test$test_all_vars__6829$fn__6830.invoke (test.clj:659)
    clojure.test/default_fixture (test.clj:617)
    clojure.test/test_all_vars (test.clj:655)
    clojure.test/test_ns (test.clj:677)
    clojure.core$map__4099$fn__4100.invoke (core.clj:1870)
    clojure.lang.LazySeq.sval (LazySeq.java:42)
    clojure.lang.LazySeq.seq (LazySeq.java:56)
    clojure.lang.Cons.next (Cons.java:37)
    clojure.lang.RT.next (RT.java:540)
    clojure.core/next (core.clj:54)
    clojure.core/reduce (core.clj:707)
    clojure.core/reduce (core.clj:698)
    clojure.core$merge_with__4189.doInvoke (core.clj:2046)
    clojure.lang.RestFn.applyTo (RestFn.java:140)
    clojure.core/apply (core.clj:480)
    clojure.test$run_tests__6846.doInvoke (test.clj:691)
    clojure.lang.RestFn.invoke (RestFn.java:1261)
    user$eval__12092$fn__12095.invoke (run-test1287913765739465401.clj:46)
    user/eval (run-test1287913765739465401.clj:44)
    clojure.lang.Compiler.eval (Compiler.java:5325)
    clojure.lang.Compiler.load (Compiler.java:5736)
    clojure.lang.Compiler.loadFile (Compiler.java:5699)
    clojure.main/load_script (main.clj:213)
    clojure.main/script_opt (main.clj:265)
    clojure.main$main__6299.doInvoke (main.clj:346)
    clojure.lang.RestFn.invoke (RestFn.java:409)
    clojure.lang.Var.invoke (Var.java:365)
    clojure.lang.AFn.applyToHelper (AFn.java:165)
  clojure.lang.Var.applyTo (Var.java:482)
    clojure.main.main (main.java:37)

FAIL in (complex-conjugate) (run-test1287913765739465401.clj:44)
expected: (= (conjugate (complex 1 2)) (complex 1 -2))
  actual: false

FAIL in (complex-conjugate) (run-test1287913765739465401.clj:44)
expected: (= (conjugate (complex -3 -7)) (complex -3 7))
  actual: false

FAIL in (complex-conjugate) (run-test1287913765739465401.clj:44)
expected: (= (conjugate (imaginary -2)) (imaginary 2))
  actual: false

FAIL in (complex-conjugate) (run-test1287913765739465401.clj:44)
expected: (= (conjugate (imaginary 5)) (imaginary -5))
  actual: false