Installing Eclipse Plugin Error

Okay so today I was trying to play with installing the CheckStyle plugin for my Eclipse 3.4 environment. This is a relatively painless process normally however I kept getting:
"An error occurred while collecting items to be installed No repository found containing: org.apache.oro/osgi.bundle/2.0.8.v200903061218"

I couldn't see any dependencies or where this was getting pulled in. Finally, I went to the Available Software tab and checked Manage Sites, here I found that even though I was only requesting to install from http://eclipse-cs.sf.net/update/ there were a number of other sites checked. I removed all checks except the checkstyle one and the install worked great.

If your not using checkStyle it's a great tool for forcing coding standards check it out.