[GAE/J] deploy 時の Conflict エラー対処

deploy をしようと思ったらこんなエラーがコンソールに出た。

Preparing to deploy:
 Created staging directory at: 'C:\Users\User\AppData\Local\Temp\appcfg3567309257153504140.tmp'
 Scanning for jsp files.
 Scanning files on local disk.
 Initiating update.
com.google.appengine.tools.admin.HttpIoException: Error posting to URL: https://appengine.google.com/api/appversion/create?app_id=hoge&version=1&
409 Conflict
Another transaction by user hogehoge is already in progress for app: hoge, version: 1. That user can undo the transaction with "appcfg rollback".

appcfg rollback をしてトランザクションをロールバックしろと。
手順はこんな感じ。

>cd "C:\Program Files\eclipse_4.2\plugins\com.google.appengine.eclipse.sdkbundle_1.7.3\appengine-java-sdk-1.7.3\bin"
>appcfg.cmd rollback "D:\workspace\hoge\war"
Reading application configuration data...
11 27, 2012 10:38:01 午後 com.google.apphosting.utils.config.AppEngineWebXmlReader readAppEngineWebXml
情報: Successfully processed D:/workspace/hoge/war\WEB-INF/appengine-web.xml
11 27, 2012 10:38:01 午後 com.google.apphosting.utils.config.AbstractConfigXmlReader readConfigXml
情報: Successfully processed D:/workspace/hoge/war\WEB-INF/web.xml
11 27, 2012 10:38:01 午後 com.google.apphosting.utils.config.AbstractConfigXmlReader readConfigXml
情報: Successfully processed D:/workspace/hoge/war\WEB-INF/cron.xml
11 27, 2012 10:38:01 午後 com.google.apphosting.utils.config.AbstractConfigXmlReader readConfigXml
情報: Successfully processed D:/workspace/hoge/war\WEB-INF/queue.xml
11 27, 2012 10:38:01 午後 com.google.apphosting.utils.config.IndexesXmlReader readConfigXml
情報: Successfully processed D:/workspace/hoge/war\WEB-INF/datastore-indexes.xml
Beginning server interaction for hoge...
0%  on backend null.
Email: ******@gmail.com
Password for ******@gmail.com:
Success.
Cleaning up temporary files...

これで deploy できるようになりました。