Hi, i need know why is this error while preverify:

  ... Compiling                                             [3-
compiled]
  ... Placing class files in JAR                            [3-
compiled]
  ... Obfuscating                                           [4-
obfuscated]
Note: duplicate definition of library class
[com.sun.cldc.i18n.j2me.UTF_8_Reader]
  ... Preverifying                                          [5-
preverified]
JAR file creation failed with error -1
The preverified classes if any are in tmp41.
  ERROR:: Error while preverifying

thanks,

JuanPablo