Got error when use the GAE storage API

[Mich via StackOverflow]

I'm using the GAE cloud API to upload image to the storage based on this document https://github.com/GoogleCloudPlatform/google-cloud-java and get error as follows:

java.lang.NoClassDefFoundError: com/google/common/base/MoreObjects
      at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
      at java.net.URLClassLoader$1.run(URLClassLoader.java:355)

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