[GitHub] incubator-spark pull request: Added extra description on ValueErro...

[AmplabJenkins]

Github user AmplabJenkins commented on the pull request:

    https://github.com/apache/incubator-spark/pull/581#issuecomment-35123081
  
    All automated tests passed.
    Refer to this link for build results: 
https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/12721/