user=> (inc "a")

java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Number
user=> *e
#error {
 :cause "java.lang.String cannot be cast to java.lang.Number"
 :via
 [{:type java.lang.ClassCastException
   :message "java.lang.String cannot be cast to java.lang.Number"
   :at [clojure.lang.Numbers inc "Numbers.java" 112]}]
 :trace
 [[clojure.lang.Numbers inc "Numbers.java" 112]
  [user$eval1556 invokeStatic "form-init7632958449209794150.clj" 1]
  [user$eval1556 invoke "form-init7632958449209794150.clj" 1]
  [clojure.lang.Compiler eval "Compiler.java" 6927]
  [clojure.lang.Compiler eval "Compiler.java" 6890]
  [clojure.core$eval invokeStatic "core.clj" 3105]
  [clojure.core$eval invoke "core.clj" 3101]
  [clojure.main$repl$read_eval_print__7408$fn__7411 invoke "main.clj" 240]
  [clojure.main$repl$read_eval_print__7408 invoke "main.clj" 240]
  [clojure.main$repl$fn__7417 invoke "main.clj" 258]
  [clojure.main$repl invokeStatic "main.clj" 258]
  [clojure.main$repl doInvoke "main.clj" 174]
  [clojure.lang.RestFn invoke "RestFn.java" 1523]
  [clojure.tools.nrepl.middleware.interruptible_eval$evaluate$fn__648 invoke "interruptible_eval.clj" 87]
  [clojure.lang.AFn applyToHelper "AFn.java" 152]
  [clojure.lang.AFn applyTo "AFn.java" 144]
  [clojure.core$apply invokeStatic "core.clj" 646]
  [clojure.core$with_bindings_STAR_ invokeStatic "core.clj" 1881]
  [clojure.core$with_bindings_STAR_ doInvoke "core.clj" 1881]
  [clojure.lang.RestFn invoke "RestFn.java" 425]
  [clojure.tools.nrepl.middleware.interruptible_eval$evaluate invokeStatic "interruptible_eval.clj" 85]
  [clojure.tools.nrepl.middleware.interruptible_eval$evaluate invoke "interruptible_eval.clj" 55]
  [clojure.tools.nrepl.middleware.interruptible_eval$interruptible_eval$fn__693$fn__696 invoke "interruptible_eval.clj" 222]
  [clojure.tools.nrepl.middleware.interruptible_eval$run_next$fn__688 invoke "interruptible_eval.clj" 190]
  [clojure.lang.AFn run "AFn.java" 22]
  [java.util.concurrent.ThreadPoolExecutor runWorker "ThreadPoolExecutor.java" 1142]
  [java.util.concurrent.ThreadPoolExecutor$Worker run "ThreadPoolExecutor.java" 617]
  [java.lang.Thread run "Thread.java" 745]]}