Oracle GridControl agent upload error

My notebook has installed oracle grid control agent.

Someday, I flashback the system, then GC agent stop upload and sync with GC server.

After I execute "emctl upload" on cmd console. It's return:


D:\oracle\agent10g\bin>emctl upload
Oracle Enterprise Manager 10g Release 5 Grid Control 10.2.0.5.0.
Copyright (c) 1996, 2009 Oracle Corporation.  All rights reserved.
---------------------------------------------------------------
EMD upload error: uploadXMLFiles skipped :: OMS version not checked yet..


I try so many ways to solve this issue, but no one was workable.

Today, I open GC web page, found a page about the agent status.

It's blocked!

I try to unblock it. But, It was still block couple seconds later.

After I read the red words, I can see what I should do.

I clicked the Agent Resynchronization Buttom.

Wait a moment, the agent status is fine.