#16 com.sixlegs.image.png.Chunk error

[Anonymous]

i get this mesage when trying to build from the demo
stockmarket quote code. have included all three class
files and the serialisationa dn transport files as well
as the ksoap directory.
error message::

Error preverifying class com.sixlegs.image.png.Chunk
java/lang/NoClassDefFoundError: java/lang/Cloneable

this is being built on netbeans 4.1 using the midp version.

please email: jonathan.fisher@expenseworld.net

with any info or updates, many thanks,
jonathan