Unable to update:
java.lang.RuntimeException: Fatal problem encountered during deployment. Please refer to the logs for more information.
	at com.google.appengine.tools.admin.AppVersionUpload.isServing(AppVersionUpload.java:1071)
	at com.google.appengine.tools.admin.AppVersionUpload.access$200(AppVersionUpload.java:45)
	at com.google.appengine.tools.admin.AppVersionUpload$2.call(AppVersionUpload.java:904)
	at com.google.appengine.tools.admin.AppVersionUpload$2.call(AppVersionUpload.java:901)
	at com.google.appengine.tools.admin.AppVersionUpload$3.call(AppVersionUpload.java:1208)
	at com.google.appengine.tools.admin.AppVersionUpload$3.call(AppVersionUpload.java:1205)
	at com.google.appengine.tools.admin.AppVersionUpload.retryWithBackoffOptional(AppVersionUpload.java:1233)
	at com.google.appengine.tools.admin.AppVersionUpload.retryWithBackoff(AppVersionUpload.java:1203)
	at com.google.appengine.tools.admin.AppVersionUpload.commit(AppVersionUpload.java:901)
	at com.google.appengine.tools.admin.AppVersionUpload.uploadFilesTransaction(AppVersionUpload.java:228)
	at com.google.appengine.tools.admin.AppVersionUpload.doUpload(AppVersionUpload.java:199)
	at com.google.appengine.tools.admin.AppAdminImpl.doUpdate(AppAdminImpl.java:571)
	at com.google.appengine.tools.admin.AppAdminImpl.update(AppAdminImpl.java:58)
	at com.google.appengine.tools.admin.AppCfg$UpdateAction.execute(AppCfg.java:1570)
	at com.google.appengine.tools.admin.AppCfg.executeAction(AppCfg.java:372)
	at com.google.appengine.tools.admin.AppCfg.<init>(AppCfg.java:227)
	at com.google.appengine.tools.admin.AppCfg.<init>(AppCfg.java:130)
	at com.google.appengine.tools.admin.AppCfg.main(AppCfg.java:126)
com.google.appengine.tools.admin.AdminException: Unable to update app: Fatal problem encountered during deployment. Please refer to the logs for more information.
	at com.google.appengine.tools.admin.AppAdminImpl.doUpdate(AppAdminImpl.java:577)
	at com.google.appengine.tools.admin.AppAdminImpl.update(AppAdminImpl.java:58)
	at com.google.appengine.tools.admin.AppCfg$UpdateAction.execute(AppCfg.java:1570)
	at com.google.appengine.tools.admin.AppCfg.executeAction(AppCfg.java:372)
	at com.google.appengine.tools.admin.AppCfg.<init>(AppCfg.java:227)
	at com.google.appengine.tools.admin.AppCfg.<init>(AppCfg.java:130)
	at com.google.appengine.tools.admin.AppCfg.main(AppCfg.java:126)
Caused by: java.lang.RuntimeException: Fatal problem encountered during deployment. Please refer to the logs for more information.
	at com.google.appengine.tools.admin.AppVersionUpload.isServing(AppVersionUpload.java:1071)
	at com.google.appengine.tools.admin.AppVersionUpload.access$200(AppVersionUpload.java:45)
	at com.google.appengine.tools.admin.AppVersionUpload$2.call(AppVersionUpload.java:904)
	at com.google.appengine.tools.admin.AppVersionUpload$2.call(AppVersionUpload.java:901)
	at com.google.appengine.tools.admin.AppVersionUpload$3.call(AppVersionUpload.java:1208)
	at com.google.appengine.tools.admin.AppVersionUpload$3.call(AppVersionUpload.java:1205)
	at com.google.appengine.tools.admin.AppVersionUpload.retryWithBackoffOptional(AppVersionUpload.java:1233)
	at com.google.appengine.tools.admin.AppVersionUpload.retryWithBackoff(AppVersionUpload.java:1203)
	at com.google.appengine.tools.admin.AppVersionUpload.commit(AppVersionUpload.java:901)
	at com.google.appengine.tools.admin.AppVersionUpload.uploadFilesTransaction(AppVersionUpload.java:228)
	at com.google.appengine.tools.admin.AppVersionUpload.doUpload(AppVersionUpload.java:199)
	at com.google.appengine.tools.admin.AppAdminImpl.doUpdate(AppAdminImpl.java:571)
	... 6 more