hydra: error bad request when running tutorial

Running the tutorial with docker computer (and docker exec -i -t hydra_hydra_1 /bin/bash to run the CLI)-- I get an error from the react-idp web UI Could not retrieve access token: Error: Bad Request. In the log I see:

hydra_1      | time="2016-08-18T09:54:31Z" level=info msg="started handling request" method=POST remote="172.18.0.4:53604" request="/oauth2/token" 
hydra_1      | time="2016-08-18T09:54:31Z" level=info msg="An error occured" error= stack=[flow_client.go:29 access_request_handler.go:74 handler.go:77 handler.go:39 router.go:299 negroni.go:41 negroni.go:24 negroni.go:33 negroni.go:33 server.go:1618 handler.go:118 handler.go:41 negroni.go:24 negroni.go:33 negroni.go:33 middleware.go:135 negroni.go:33 negroni.go:73 server.go:2081 server.go:1472 asm_amd64.s:1998] 
hydra_1      | time="2016-08-18T09:54:31Z" level=info msg="completed handling request" measure#web.latency=116204160 method=POST remote="172.18.0.4:53604" request="/oauth2/token" status=400 text_status="Bad Request" took=116.20416ms 
consent_1    | { error: 'Could not retrieve access token: Error: Bad Request' }

Am I doing something wrong? Thanks!