"Retrieving operation failed: could not get result" errors.

2013-02-13 01:43:07,453 BitbucketConnectorExecutorServiceThread:thread-1 WARN ServiceRunner    com.atlassian.jira.plugins.dvcs.scheduler.DvcsScheduler:job [dvcs.servi
ce.remote.ChangesetIterator] Error obtaining detailed changeset for https://github.ngmoco.com/Mobage/WebGame-defunct-test-repo, node=ef6ed8f1544a059f2488fd1ea8f95377a
8d6728b
com.atlassian.jira.plugins.dvcs.exception.SourceControlException: could not get result
        at com.atlassian.jira.plugins.dvcs.spi.github.GithubCommunicator.getDetailChangeset(GithubCommunicator.java:172)
        at com.atlassian.jira.plugins.dvcs.service.remote.ChangesetIterator$1.call(BranchedChangesetIterator.java:151)
        at com.atlassian.jira.plugins.dvcs.service.remote.ChangesetIterator$1.call(BranchedChangesetIterator.java:147)
        at com.atlassian.jira.plugins.dvcs.util.Retryer.retry(Retryer.java:48)
        at com.atlassian.jira.plugins.dvcs.util.Retryer.retry(Retryer.java:18)
        at com.atlassian.jira.plugins.dvcs.service.remote.ChangesetIterator.getDetailedChangeset(BranchedChangesetIterator.java:146)
        at com.atlassian.jira.plugins.dvcs.service.remote.ChangesetIterator.next(BranchedChangesetIterator.java:118)
        at com.atlassian.jira.plugins.dvcs.service.remote.BranchedChangesetIterator.next(BranchedChangesetIterator.java:66)
        at com.atlassian.jira.plugins.dvcs.service.remote.BranchedChangesetIterator.next(BranchedChangesetIterator.java:23)
        at com.atlassian.jira.plugins.dvcs.sync.impl.DefaultSynchronisationOperation.synchronise(DefaultSynchronisationOperation.java:64)
        at com.atlassian.jira.plugins.dvcs.sync.impl.DefaultSynchronizer$1.run(DefaultSynchronizer.java:79)
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
        at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
        at java.util.concurrent.FutureTask.run(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)
Caused by: org.eclipse.egit.github.core.client.RequestException: Server Error (500)
        at org.eclipse.egit.github.core.client.GitHubClient.createException(GitHubClient.java:516)
        at org.eclipse.egit.github.core.client.GitHubClient.get(GitHubClient.java:662)
        at org.eclipse.egit.github.core.service.CommitService.getCommit(CommitService.java:179)
        at com.atlassian.jira.plugins.dvcs.spi.github.GithubCommunicator.getDetailChangeset(GithubCommunicator.java:168)
        ... 16 more