Software Update Error

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From your question, I can assume two points

1. You are a new user
2. You are running Fedora 18 rawhide release

Now, what is a rawhide release? According to fedoraproject.org:

Rawhide is the name given to the current development head of Fedora. It consists of a package repository called "rawhide" and contains the latest build of all Fedora packages updated on a daily basis.

Who should use Rawhide?

End users should not use Rawhide as their main day-to-day workstation. Because Rawhide is a development branch, many changes are not heavily tested (or tested at all) before being released to Rawhide, and packages in Rawhide can and do break without warning.

Here, what happened in your case is that a package is broken. From your error report, it seems to be ibus-pinyin.

The Solution

• Considering that you are new to Fedora, I strongly recommend you to use a stable release such as Fedora 17. I too am using Fedora 17.
• If you still insist to use current rawhide release, wait for two or three days, and usually the broken packages and its dependencies will be resolved.