Error installing fix pack 7 in WC Enterprise Developer

Hello,
I tried to Installing Web Sphere Commerce Developer fix packs with the IBM Installation Manager base on info center http://pic.dhe.ibm.com/infocenter/wchelp/v7r0m0/index.jsp?topic=/com.ibm.commerce.install.doc/tasks/tigimfpdevinstall.htm
I already update my RAD from 7.5.4 to 7.5.5.1 and follow the steps in info center link above. But I got error when updating the fix pack, and I got message error from a log file (updatelog.txt) like this: Any suggestion? Thanks.

IBM Installation Manager
Update Packages
Review the summary information. Click Back to make changes or click update.
Update Packages
Error during “post-install configure “phase:
