java.util.zip.ZipException: duplicate entry: META-INF/

I am trying to jar up a file and getting this exception, not sure what
could be wrong. The same piece of code works fine in few machines but
there is one machine where this piece of code gives this exception ,
any help is very much appreciated, thanks
......java.util .zip.ZipExce
ption: duplicate entry: META-INF/
java.util.zip.Z ipException: duplicate entry: META-INF/
at
java.util.zip.Z ipOutputStream. putNextEntry(Zi pOutputStream.j ava:160)
at
java.util.jar.J arOutputStream. putNextEntry(Ja rOutputStream.j ava:88)
at
com.webct.platf orm