Any suggestion for this topic?How to troubleshoot? Please advise?

Here is the log:
*----*
*c:\apppengine\bin\bin>appcfg.cmd -A XXXXXXX; -V 1 download_app 
C:\apppengine\co*
*de*
*0% Fetching file list...*
*5月 28, 2015 11:29:08 上午 
com.google.appengine.tools.admin.AbstractServerConnec*
*tion send1*
*WARNING: Error posting to URL: 
https://appengine.google.com/api/files/list?versi*
*on_match=1&app_id=XXXXXXX%3B&*
*400 Bad Request*
*Client Error (400)The request is invalid for an unspecified reason.*
*This is try #0*
*5月 28, 2015 11:29:08 上午 
com.google.appengine.tools.admin.AbstractServerConnec*
*tion send1*
*WARNING: Error posting to URL: 
https://appengine.google.com/api/files/list?versi*
*on_match=1&app_id=XXXXXXX%3B&*
*400 Bad Request*
*Client Error (400)The request is invalid for an unspecified reason.*
*This is try #1*
*5月 28, 2015 11:29:08 上午 
com.google.appengine.tools.admin.AbstractServerConnec*
*tion send1*
*WARNING: Error posting to URL: 
https://appengine.google.com/api/files/list?versi*
*on_match=1&app_id=XXXXXXX%3B&*
*400 Bad Request*
*Client Error (400)The request is invalid for an unspecified reason.*
*This is try #2*
*5月 28, 2015 11:29:09 上午 
com.google.appengine.tools.admin.AbstractServerConnec*
*tion send1*
*WARNING: Error posting to URL: 
https://appengine.google.com/api/files/list?versi*
*on_match=1&app_id=XXXXXXX%3B&*
*400 Bad Request*
*Client Error (400)The request is invalid for an unspecified reason.*
*This is try #3*

*Error Details:*
*Error posting to URL: 
https://appengine.google.com/api/files/list?version_match=*
*1&app_id=XXXXXXX%3B&*
*400 Bad Request*
*Client Error (400)The request is invalid for an unspecified reason.*


*Unable to fetch file list.*


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