First I would try this compile fileTree(dir: 'libs', include: '*.jar') instead. It will grab all the jars you have in libs and include them. I am hoping you don't have any jars you don't want to include. I am also hoping this will solve your problem since I'm hoping you spelled something wrong since google-api-services-storage-v1beta2-rev42-1.17.0-rc.jar' is a mouthful :).
Are you using proguard by any chance? If so I would recommend turning that off, or try adding a specific rule.