I am developing an j2me application using MIDP 1.0.3 CLDC 1.0.4 and WTK 1.0.4_02 when i test the application with default emulator all run fine, but if I try to use the Nokia Series_60_MIDP_SDK_for_Symbian_OS_v_1_2_1 appear this message:
Emulator: Missing JAR file.

Emulator command: c:\WTK104\wtklib\devices\Series_60_MIDP_SDK_for_Symbian_OS_v_1_2_1\bin\Series_60_MIDP_SDK_for_Symbian_OS_v_1_2_1\epoc32\release\wins\udeb\kmidp_debug.exe -parent_port 2810 -classpath c:\WTK104\wtklib\devices\Series_60_MIDP_SDK_for_Symbian_OS_v_1_2_1\lib\Series_60_MIDP_SDK_for_Symbian_OS_v_1_2_1\j2me-debug.zip -descriptor c:\tmp\midp\Mexal_Mobile.jad Mexal_Mobile

java.lang.NullPointerException
at com.symbian.midp.compatibility.runtime.MIDletExecutor.runMIDlet(+131)
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)

Somebody could help me to solve this problem?
Thank You very much
Marco