ERROR undefined method `request_uri'

[pkrull]

I get the following errors when trying to run the reaper.

docker run -e CATTLE_URL=<redacted> -e CATTLE_ACCESS_KEY=<redacted> -e CATTLE_SECRET_KEY=<redacted> -e AWS_ACCESS_KEY_ID=<redacted> -e AWS_SECRET_ACCESS_KEY=<redacted> -e REAPER_DRY_RUN=true -e REAPER_INTERVAL_SECS=-1 -e REAPER_INSTANCE_ID_LABEL_NAME=instanceid --rm ampedandwired/rancher-reaper:latest
Unable to find image 'ampedandwired/rancher-reaper:latest' locally
latest: Pulling from ampedandwired/rancher-reaper
90f4dba627d6: Pull complete 
98c1a7514ba6: Pull complete 
e970acb20b34: Pull complete 
5a1603643434: Pull complete 
505ec6100fdd: Pull complete 
ccd0db5bc7b3: Pull complete 
0353f8ee33b8: Pull complete 
5e4129a6295c: Pull complete 
340db6589be4: Pull complete 
09933c1412db: Pull complete 
5d147c81f520: Pull complete 
Digest: sha256:ce5e47c655aa5f9594cf638d245d18fe327e53b7604fc920587fa8dd2bfdd048
Status: Downloaded newer image for ampedandwired/rancher-reaper:latest
/usr/local/bundle/gems/thin-1.7.0/lib/thin/server.rb:107: warning: constant ::Fixnum is deprecated
I, [2018-05-17T22:43:50.830220 #7]  INFO -- : Rancher AWS host reaper started
I, [2018-05-17T22:43:50.830272 #7]  INFO -- : Reaping terminated AWS hosts...
W, [2018-05-17T22:43:50.830307 #7]  WARN -- : *** Dry run - no changes will be applied
E, [2018-05-17T22:43:50.830462 #7] ERROR -- : undefined method `request_uri' for #<URI::Generic:0x0055df8aa7b178> (NoMethodError)
/usr/src/app/rancher_api.rb:58:in `make_api_request'
/usr/src/app/rancher_api.rb:12:in `get'
/usr/src/app/rancher_api.rb:18:in `block (2 levels) in get_all'
/usr/src/app/rancher_api.rb:17:in `loop'
/usr/src/app/rancher_api.rb:17:in `block in get_all'
/usr/src/app/reaper.rb:52:in `each'
/usr/src/app/reaper.rb:52:in `each'
/usr/src/app/reaper.rb:52:in `reap_hosts'
/usr/src/app/reaper.rb:32:in `run'
config.ru:30:in `block (2 levels) in <main>'
I, [2018-05-17T22:43:50.831671 #7]  INFO -- : Rancher AWS host reaper exited

Is this a user error or is the container not up-to-date? Thanks for any help with this.