Hi there,
I'm following the example you made in the README for S3 - I'm just trying to put a file.

When I run my webserver, it throws the below error:

Execution error (IllegalStateException) at roller-ball.storage.s3-ops/eval4652$loading (s3_ops.clj:1).
download already refers to: #'amazonica.aws.s3/download in namespace: roller-ball.storage.s3-ops

I don't have any functions called "download" in my app. The source code is here. The specific file where I use the amazonica lib is here. I ran below grep from the root of the project and confirmed no output, so I don't understand where the error is coming from

grep -r "download" .

Thank you in advance!

h2. Additional info
When I remove the [amazonica.aws.s3transfer] from the

(:use [amazonica.aws.s3]
[amazonica.aws.s3transfer])

the app runs, but then I get a java.lang.ClassNotFoundException exception - I guess thats required. All that said, I can't seem to find any function called put-object in the repo, whether in s3 or s3transfer... I'm kinda new to clojure and jvm languages in general, so apologies if this is a basic thing I'm not getting.

h2. Additional output

{:clojure.main/message
"Execution error (IllegalStateException) at roller-ball.storage.s3-ops/eval4652$loading (s3_ops.clj:1).\ndownload already refers to: #'amazonica.aws.s3/download in namespace: roller-ball.storage.s3-ops\n",
:clojure.main/triage
{:clojure.error/class java.lang.IllegalStateException,
:clojure.error/line 1,
:clojure.error/cause
"download already refers to: #'amazonica.aws.s3/download in namespace: roller-ball.storage.s3-ops",
:clojure.error/symbol roller-ball.storage.s3-ops/eval4652$loading,
:clojure.error/source "s3_ops.clj",
:clojure.error/phase :execution},
:clojure.main/trace
{:via
[{:type clojure.lang.Compiler$CompilerException,
:message
"Syntax error macroexpanding at (roller_ball/storage/s3_ops.clj:1:1).",
:data
{:clojure.error/phase :execution,
:clojure.error/line 1,
:clojure.error/column 1,
:clojure.error/source "roller_ball/storage/s3_ops.clj"},
:at [clojure.lang.Compiler load "Compiler.java" 7665]}
{:type java.lang.IllegalStateException,
:message
"download already refers to: #'amazonica.aws.s3/download in namespace: roller-ball.storage.s3-ops",
:at
[clojure.lang.Namespace warnOrFailOnReplace "Namespace.java" 88]}],
:trace
[[clojure.lang.Namespace warnOrFailOnReplace "Namespace.java" 88]
[clojure.lang.Namespace reference "Namespace.java" 110]
[clojure.lang.Namespace refer "Namespace.java" 168]
[clojure.core$refer invokeStatic "core.clj" 4253]
[clojure.core$refer doInvoke "core.clj" 4218]
[clojure.lang.RestFn invoke "RestFn.java" 410]
[clojure.lang.AFn applyToHelper "AFn.java" 154]
[clojure.lang.RestFn applyTo "RestFn.java" 132]
[clojure.core$apply invokeStatic "core.clj" 669]
[clojure.core$load_lib invokeStatic "core.clj" 5997]
[clojure.core$load_lib doInvoke "core.clj" 5953]
[clojure.lang.RestFn applyTo "RestFn.java" 142]
[clojure.core$apply invokeStatic "core.clj" 669]
[clojure.core$load_libs invokeStatic "core.clj" 6016]
[clojure.core$load_libs doInvoke "core.clj" 6000]
[clojure.lang.RestFn applyTo "RestFn.java" 137]
[clojure.core$apply invokeStatic "core.clj" 671]
[clojure.core$use invokeStatic "core.clj" 6128]
[clojure.core$use doInvoke "core.clj" 6128]
[clojure.lang.RestFn invoke "RestFn.java" 421]
[roller_ball.storage.s3_ops$eval4652$loading__6789__auto____4653
invoke
"s3_ops.clj"
1]
[roller_ball.storage.s3_ops$eval4652 invokeStatic "s3_ops.clj" 1]
[roller_ball.storage.s3_ops$eval4652 invoke "s3_ops.clj" 1]
[clojure.lang.Compiler eval "Compiler.java" 7194]
[clojure.lang.Compiler eval "Compiler.java" 7183]
[clojure.lang.Compiler load "Compiler.java" 7653]
[clojure.lang.RT loadResourceScript "RT.java" 381]
[clojure.lang.RT loadResourceScript "RT.java" 372]
[clojure.lang.RT load "RT.java" 459]
[clojure.lang.RT load "RT.java" 424]
[clojure.core$load$fn__6908 invoke "core.clj" 6161]
[clojure.core$load invokeStatic "core.clj" 6160]
[clojure.core$load doInvoke "core.clj" 6144]
[clojure.lang.RestFn invoke "RestFn.java" 408]
[clojure.core$load_one invokeStatic "core.clj" 5933]
[clojure.core$load_one invoke "core.clj" 5928]
[clojure.core$load_lib$fn__6850 invoke "core.clj" 5975]
[clojure.core$load_lib invokeStatic "core.clj" 5974]
[clojure.core$load_lib doInvoke "core.clj" 5953]
[clojure.lang.RestFn applyTo "RestFn.java" 142]
[clojure.core$apply invokeStatic "core.clj" 669]
[clojure.core$load_libs invokeStatic "core.clj" 6016]
[clojure.core$load_libs doInvoke "core.clj" 6000]
[clojure.lang.RestFn applyTo "RestFn.java" 137]
[clojure.core$apply invokeStatic "core.clj" 669]
[clojure.core$require invokeStatic "core.clj" 6038]
[clojure.core$require doInvoke "core.clj" 6038]
[clojure.lang.RestFn invoke "RestFn.java" 408]
[roller_ball.api.POST_upload_object$eval4646$loading__6789__auto____4647
invoke
"POST_upload_object.clj"
1]
[roller_ball.api.POST_upload_object$eval4646
invokeStatic
"POST_upload_object.clj"
1]
[roller_ball.api.POST_upload_object$eval4646
invoke
"POST_upload_object.clj"
1]
[clojure.lang.Compiler eval "Compiler.java" 7194]
[clojure.lang.Compiler eval "Compiler.java" 7183]
[clojure.lang.Compiler load "Compiler.java" 7653]
[clojure.lang.RT loadResourceScript "RT.java" 381]
[clojure.lang.RT loadResourceScript "RT.java" 372]
[clojure.lang.RT load "RT.java" 459]
[clojure.lang.RT load "RT.java" 424]
[clojure.core$load$fn__6908 invoke "core.clj" 6161]
[clojure.core$load invokeStatic "core.clj" 6160]
[clojure.core$load doInvoke "core.clj" 6144]
[clojure.lang.RestFn invoke "RestFn.java" 408]
[clojure.core$load_one invokeStatic "core.clj" 5933]
[clojure.core$load_one invoke "core.clj" 5928]
[clojure.core$load_lib$fn__6850 invoke "core.clj" 5975]
[clojure.core$load_lib invokeStatic "core.clj" 5974]
[clojure.core$load_lib doInvoke "core.clj" 5953]
[clojure.lang.RestFn applyTo "RestFn.java" 142]
[clojure.core$apply invokeStatic "core.clj" 669]
[clojure.core$load_libs invokeStatic "core.clj" 6016]
[clojure.core$load_libs doInvoke "core.clj" 6000]
[clojure.lang.RestFn applyTo "RestFn.java" 137]
[clojure.core$apply invokeStatic "core.clj" 669]
[clojure.core$require invokeStatic "core.clj" 6038]
[clojure.core$require doInvoke "core.clj" 6038]
[clojure.lang.RestFn invoke "RestFn.java" 408]
[roller_ball.api.router$eval2756$loading__6789__auto____2757
invoke
"router.clj"
1]
[roller_ball.api.router$eval2756 invokeStatic "router.clj" 1]
[roller_ball.api.router$eval2756 invoke "router.clj" 1]
[clojure.lang.Compiler eval "Compiler.java" 7194]
[clojure.lang.Compiler eval "Compiler.java" 7183]
[clojure.lang.Compiler load "Compiler.java" 7653]
[clojure.lang.RT loadResourceScript "RT.java" 381]
[clojure.lang.RT loadResourceScript "RT.java" 372]
[clojure.lang.RT load "RT.java" 459]
[clojure.lang.RT load "RT.java" 424]
[clojure.core$load$fn__6908 invoke "core.clj" 6161]
[clojure.core$load invokeStatic "core.clj" 6160]
[clojure.core$load doInvoke "core.clj" 6144]
[clojure.lang.RestFn invoke "RestFn.java" 408]
[clojure.core$load_one invokeStatic "core.clj" 5933]
[clojure.core$load_one invoke "core.clj" 5928]
[clojure.core$load_lib$fn__6850 invoke "core.clj" 5975]
[clojure.core$load_lib invokeStatic "core.clj" 5974]
[clojure.core$load_lib doInvoke "core.clj" 5953]
[clojure.lang.RestFn applyTo "RestFn.java" 142]
[clojure.core$apply invokeStatic "core.clj" 669]
[clojure.core$load_libs invokeStatic "core.clj" 6016]
[clojure.core$load_libs doInvoke "core.clj" 6000]
[clojure.lang.RestFn applyTo "RestFn.java" 137]
[clojure.core$apply invokeStatic "core.clj" 669]
[clojure.core$require invokeStatic "core.clj" 6038]
[clojure.core$require doInvoke "core.clj" 6038]
[clojure.lang.RestFn invoke "RestFn.java" 408]
[roller_ball.core$eval157$loading__6789__auto____158
invoke
"core.clj"
1]
[roller_ball.core$eval157 invokeStatic "core.clj" 1]
[roller_ball.core$eval157 invoke "core.clj" 1]
[clojure.lang.Compiler eval "Compiler.java" 7194]
[clojure.lang.Compiler eval "Compiler.java" 7183]
[clojure.lang.Compiler load "Compiler.java" 7653]
[clojure.lang.RT loadResourceScript "RT.java" 381]
[clojure.lang.RT loadResourceScript "RT.java" 372]
[clojure.lang.RT load "RT.java" 459]
[clojure.lang.RT load "RT.java" 424]
[clojure.core$load$fn__6908 invoke "core.clj" 6161]
[clojure.core$load invokeStatic "core.clj" 6160]
[clojure.core$load doInvoke "core.clj" 6144]
[clojure.lang.RestFn invoke "RestFn.java" 408]
[clojure.core$load_one invokeStatic "core.clj" 5933]
[clojure.core$load_one invoke "core.clj" 5928]
[clojure.core$load_lib$fn__6850 invoke "core.clj" 5975]
[clojure.core$load_lib invokeStatic "core.clj" 5974]
[clojure.core$load_lib doInvoke "core.clj" 5953]
[clojure.lang.RestFn applyTo "RestFn.java" 142]
[clojure.core$apply invokeStatic "core.clj" 669]
[clojure.core$load_libs invokeStatic "core.clj" 6016]
[clojure.core$load_libs doInvoke "core.clj" 6000]
[clojure.lang.RestFn applyTo "RestFn.java" 137]
[clojure.core$apply invokeStatic "core.clj" 669]
[clojure.core$require invokeStatic "core.clj" 6038]
[clojure.core$require doInvoke "core.clj" 6038]
[clojure.lang.RestFn invoke "RestFn.java" 408]
[user$eval140$fn__144 invoke "form-init2272812208049848090.clj" 1]
[user$eval140 invokeStatic "form-init2272812208049848090.clj" 1]
[user$eval140 invoke "form-init2272812208049848090.clj" 1]
[clojure.lang.Compiler eval "Compiler.java" 7194]
[clojure.lang.Compiler eval "Compiler.java" 7184]
[clojure.lang.Compiler load "Compiler.java" 7653]
[clojure.lang.Compiler loadFile "Compiler.java" 7591]
[clojure.main$load_script invokeStatic "main.clj" 475]
[clojure.main$init_opt invokeStatic "main.clj" 477]
[clojure.main$init_opt invoke "main.clj" 477]
[clojure.main$initialize invokeStatic "main.clj" 508]
[clojure.main$null_opt invokeStatic "main.clj" 542]
[clojure.main$null_opt invoke "main.clj" 539]
[clojure.main$main invokeStatic "main.clj" 664]
[clojure.main$main doInvoke "main.clj" 616]
[clojure.lang.RestFn applyTo "RestFn.java" 137]
[clojure.lang.Var applyTo "Var.java" 705]
[clojure.main main "main.java" 40]],
:cause
"download already refers to: #'amazonica.aws.s3/download in namespace: roller-ball.storage.s3-ops",
:phase :execution}}