bind weblogic6 to jbuilder6

[zb cong]

hello come back again
i download a evaluation version of weblogic6 many days ago(i don't remember the date for sure),today i want to bind it to my jb6,i keep up with the help document,enable it as the project server of my project,then i start the weblogic from the "start" menu of my computer SUCCESSFULLY,in the jb6,i select "run" icon,then "server" to start project server,it ask me to input the weblogic password,after that,it tell me follow:

$$$$$$$$$$$$$$$$ License Exception $$$$$$$$$$$$$$$$

Unable to start WebLogic Server !!
Missing license file for: WebLogic Server 6.1

$$$$$$$$$$$$$$$$ License Exception $$$$$$$$$$$$$$$$
why?
thanks for helps!