Can new post but update post error

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Please help me!

I can post new message and upload image, but I can't update my post.
How can I solve this problem?

Error.  Message Not Posted

Detail : your message did not contain a valid subject heading and/or message body.

I check my edit post can't show subject 
(

Subject:
< id=subject maxLength=50 size=30 value="Can new post but update post error" name=subject> 
) 

It is disappeared. It shows only Message editor.

thank you so much.

muiee