在Jbuilder7+Series_60_MIDP_SDK_for_Symbian_OS_v_1_2环境下编译http应用程序，程序不能运行，报错：
C:\Nokia\Devices\Series_60_MIDP_SDK_for_Symbian_OS_v_1_2\bin\emulator.exe -classpath "D:\jbproject\CallServletGET\classes;" -Xdevice:Series_60_MIDP_SDK_for_Symbian_OS_v_1_2 -Xdescriptor:"D:\jbproject\CallServletGET\jad-temp\CallServletGET.jad"
Emulator: Missing JAR file.

Emulator command: C:\Nokia\Devices\Series_60_MIDP_SDK_for_Symbian_OS_v_1_2\bin\Series_60_MIDP_SDK_for_Symbian_OS_v_1_2\epoc32\release\wins\udeb\kmidp_debug.exe -parent_port 2810 -classpath C:\Nokia\Devices\Series_60_MIDP_SDK_for_Symbian_OS_v_1_2\lib\Series_60_MIDP_SDK_for_Symbian_OS_v_1_2\j2me-debug.zip -descriptor c:\tmp\midp\CallServletGET.jad CallServletGET

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)

而相同程序在J2me wireless Toolkit 1.0.4_01模拟器中运行正常，请问该如何解决？谢谢!!