i recognize this problem running a simple simple hello world midlet using jbuilder & series60_midp_sdk ... all other ready software can't run .... i tried also with other ready jad running directly in stand alon

java.lang.RuntimeException: Class not found in runMIDlet: java.lang.ClassNotFoundException: midlettest.MIDlet1
at com.symbian.midp.compatibility.runtime.MIDletExecutor.runMIDlet(+143)
at com.symbian.midp.compatibility.runtime.MIDletMain.runFirstMIDlet(+77)
at com.symbian.midp.compatibility.runtime.MIDletMain.run(+346)
at com.sun.midp.midlet.Main.main(+56)