Problema no primeiro Projeto :(

Estou começando a estudar JME. Instalei WTK2.5.2 no meu ubunto.
Só que quando eu rodo no eclipse o emulador tá dando o seguinte erro:

Running with storage root /home/david/j2mewtk/2.5.2/appdb/MediaControlSkin
Running with locale: pt_BR.UTF-8
Running in the identified_third_party security domain
java.lang.ClassNotFoundException: com/Tk
at com.sun.midp.midlet.MIDletState.createMIDlet(+29)
at com.sun.midp.midlet.Scheduler.schedule(+52)
at com.sun.midp.main.Main.runLocalClass(+28 )
at com.sun.midp.main.Main.main(+80)
Execution completed.
3383227 bytecodes executed
55 thread switches
1665 classes in the system (including system classes)
17507 dynamic objects allocated (521480 bytes)
1 garbage collections (0 bytes collected)

Alguem pode me ajudar???