add a server from Coldfusion Builder using CF8 on Weblogic 10

I have CF8 deployed and running on Weblogic 10. I access the CF8 admin console via http://localhost:8001/CFIDE/administrator/index.cfm. My CF8's wwwroot is C:\bea\user_projects\domains\local_domain1\autodeploy\cfusion\.

I wanted to add a server in CF Builder point to it. However, not matter what path I tried to put in the Server Home, it always return a message "Invalid Server Home Directory" when I clicked Finish. Can someone help me on this?