appc help!

[Mingze Yang]

Hi, there, I got the following error when I was trying to use Weblogic 8.1 appc,
.../ex12_2<3781> /user/myang/bea/jdk141_03/bin/java weblogic.appc ./build
java.lang.ClassCastException
at weblogic.ejb20.dd.xml.DDUtils.processXML(DDUtils.java:320)
at weblogic.ejb20.dd.xml.DDUtils.processXML(DDUtils.java:295)
at weblogic.ejb20.dd.xml.DDUtils.processWLEjbJarXML(DDUtils.java:281)
at weblogic.ejb20.dd.xml.DDUtils.createDescriptorFromJarFile(DDUtils.java:139)
at weblogic.ejb20.ejbc.EJBCompiler.compileEJB(EJBCompiler.java:374)
at weblogic.appc.compileEJB(appc.java:796)
at weblogic.appc.compileEJB(appc.java:770)
at weblogic.appc.compileInput(appc.java:462)
at weblogic.appc.runBody(appc.java:183)
at weblogic.utils.compiler.Tool.run(Tool.java:146)
at weblogic.utils.compiler.Tool.run(Tool.java:103)
at weblogic.appc.main(appc.java:1022)
Any suggestions? Thanks a lot.