Add the following to your build.gradle file:

dependencies {
   runtime group: 'org.slf4j', name: 'slf4j-api', version: '1.7.25'
   runtime group: 'com.google.guava', name:'guava', version:'18.0'
   runtime group: 'com.google.code.gson', name: 'gson', version: '2.8.0'
 }