obfuscate problem

Hi all, i try to use obfuscator for a midlet that use nokia class FullCanvas
and for this reason i have an error:

# Unrecoverable error during obfuscation:
# java.lang.ClassNotFoundException: com.nokia.mid.ui.FullCanvas
java.lang.ClassNotFoundException: com.nokia.mid.ui.FullCanvas
       at java.net.URLClassLoader$1.run(URLClassLoader.java:198)
       at java.security.AccessController.doPrivileged(Native Method)
       at java.net.URLClassLoader.findClass(URLClassLoader.java:186)
       at java.lang.ClassLoader.loadClass(ClassLoader.java:299)
       at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:265)
       at java.lang.ClassLoader.loadClass(ClassLoader.java:255)
       at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:315)
       at java.lang.Class.forName0(Native Method)
       at java.lang.Class.forName(Class.java:140)
       at a.a.a.f.a(Unknown Source)
       at a.a.a.f.a(Unknown Source)
       at a.a.a.f.a(Unknown Source)
       at a.a.a.f.a(Unknown Source)
       at a.a.a.f.j(Unknown Source)
       at a.a.a.j$4.a(Unknown Source)
       at a.a.a.j.a(Unknown Source)
       at a.a.a.j.a(Unknown Source)
       at a.a.a.j.a(Unknown Source)
       at a.a.a.j.a(Unknown Source)
       at a.a.a.j.a(Unknown Source)
       at a.a.a.j.a(Unknown Source)
       at a.a.a.j.if(Unknown Source)
       at a.a.a.s.do(Unknown Source)
       at a.a.a.s.a(Unknown Source)
       at RetroGuard.a(Unknown Source)
       at RetroGuard.a(Unknown Source)
       at RetroGuard.main(Unknown Source)

Someone can help me?

Regards
Gionny

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