no manifiest section for signature file entry javax/mail/internet/AsciiOutputStream

Bonjour,
en deployant un simple web service dans mon application CDC mobile avec netbeans IDE 6.1 je devais importer mail.jar
et là je recois l'erreur suivante:

java.lang.SecurityException: no manifiest section for signature file entry javax/mail/internet/AsciiOutputStream.class
at sun.security.util.SignatureFileVerifier.verifySection(SignatureFileVerifier.java:259)
at sun.security.util.SignatureFileVerifier.process(SignatureFileVerifier.java:171)
at java.util.jar.JarVerifier.processEntry(JarVerifier.java:240)
at java.util.jar.JarVerifier.update(JarVerifier.java:195)
at java.util.jar.JarFile.initializeVerifier(JarFile.java:251)
at java.util.jar.JarFile.getInputStream(JarFile.java:313)
at sun.misc.Launcher$AppClassLoader.defineClassPrivate(Launcher.java:525)
at sun.misc.Launcher$AppClassLoader.access$500(Launcher.java:325)
at sun.misc.Launcher$4.run(Launcher.java:546)
at java.security.AccessController.doPrivileged(AccessController.java:332)
at java.security.AccessController.doPrivileged(AccessController.java:301)
at sun.misc.Launcher$AppClassLoader.doClassFind(Launcher.java:540)
at sun.misc.Launcher$AppClassLoader.findClass(Launcher.java:588)
at java.lang.ClassLoader.loadClass(ClassLoader.java:320)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:401)
at java.lang.ClassLoader.loadClass(ClassLoader.java:263)
at sun.misc.CVM.runMain(CVM.java:458)


avez vous idée dpour resoudre le probleme?