throw warning when opening pages.xml in webcenter application

When opening pages.xml in our custom webcenter application to edit the security access, there is an error msg shown on message log board:

Nov 25, 2011 5:13:04 PM oracle.jps.credstore


WARNING: Opening of wallet based credential store failed. Reason java.io.IOException: PKI-02002: Unable to open the wallet. Check password.

And even pages.xml can open, but the security shows nothing there.
 
Cause:
 
There is a cwallet.sso file under src\META-INF folder. please check this file is valid or not.
 

 
Solution:
 
As we have source control of project source codes, reverse to the right version, and it works properly.