Problem with dependency com.nimbusds:nimbus-jose-jwt:8.12

I'm having a problem trying to download the dependency

org.grails.plugins:spring-security-rest:3.0.1. I'm getting the following error:

Execution failed for task ':compileGroovy'.
> Could not resolve all files for ':compileClasspath' configuration.
> Could not resolve net.minidev:json-smart:[1.3.1,2.3].
Asked by:
project : > org.grails.plugins:spring-security-rest:3.0.1 > com.nimbusds:nimbus-jose-jwt:8.12
> Failed to list versions for net.minidev:json-smart.
> Unable to load Maven metadata from http://dl.bintray.com/agorapulse/plugins/net/minidev/json-smart/maven-metadata.xml.
> Could not get resource 'http://dl.bintray.com/agorapulse/plugins/net/minidev/json-smart/maven-metadata.xml'.
> Could not GET 'http://dl.bintray.com/agorapulse/plugins/net/minidev/json-smart/maven-metadata.xml'. Status code 502 received from server: Bad Gateway

Start by reproducing the `:compileGroovy` dependency-resolution failure for `org.grails.plugins:spring-security-rest:3.0.1`. Check the requested `net.minidev:json-smart` metadata and the referenced Bintray URL, then determine whether the dependency can resolve from an available repository. Done means the reported dependency can be downloaded without the 502 error.

Written by the indexing model from the issue text.