Example failure: 
https://uberchromegw.corp.google.com/i/chromeos/builders/chell-chrome-pfq/builds/1822

Error message:
05:03:28: INFO: Running cidb query on pid 32414, repr(query) starts with <sqlalchemy.sql.expression.Update object at 0x7f32ddd38c90>
Preconditions for the stage successfully met. Beginning to execute stage...
05:03:28: INFO: Running cidb query on pid 32414, repr(query) starts with <sqlalchemy.sql.expression.Update object at 0x7f32ddbc7ad0>
05:03:28: INFO: Running cidb query on pid 32414, repr(query) starts with <sqlalchemy.sql.expression.Select at 0x7f32ddb66210; Select object>
05:03:28: INFO: Running cidb query on pid 32414, repr(query) starts with 'SELECT id, build_config, start_time, finish_time, status, waterfall, build_number, builder_name, pl
05:03:28: INFO: Running cidb query on pid 32414, repr(query) starts with <sqlalchemy.sql.expression.Select at 0x7f32ddb66090; Select object>
05:03:29: INFO: Updating manifest-versions checkout.
05:04:21: ERROR: <class 'chromite.cbuildbot.manifest_version.BuildSpecsValueError'>: Failure in BootstrapFromVersion. InitializeManifestVariables failed after RefreshManifestCheckout for version 10340.0.0-rc1.
Traceback (most recent call last):
  File "/b/c/cbuild/repository/chromite/lib/failures_lib.py", line 229, in wrapped_functor
    return functor(*args, **kwargs)
  File "/b/c/cbuild/repository/chromite/cbuildbot/stages/sync_stages.py", line 763, in PerformStage
    next_manifest = self.ForceVersion(version)
  File "/b/c/cbuild/repository/chromite/cbuildbot/stages/sync_stages.py", line 847, in ForceVersion
    manifest = super(MasterSlaveLKGMSyncStage, self).ForceVersion(version)
  File "/b/c/cbuild/repository/chromite/cbuildbot/stages/sync_stages.py", line 571, in ForceVersion
    return self.manifest_manager.BootstrapFromVersion(version)
  File "/b/c/cbuild/repository/chromite/cbuildbot/manifest_version.py", line 666, in BootstrapFromVersion
    '%s.' % version)
BuildSpecsValueError: Failure in BootstrapFromVersion. InitializeManifestVariables failed after RefreshManifestCheckout for version 10340.0.0-rc1.