I'm trying to deploy some Custom Code but am getting this exception.  What does it mean?
	 
	deploy:
	    [input] skipping input as property jarFileName has already been set.
	     [java] Exception in thread "main" com.shephertz.app42.paas.sdk.java.App42Ba
	dParameterException: {"app42Fault":{"httpErrorCode":400,"appErrorCode":1900,"mes
	sage":"Bad Request","details":"Package can not be used in custom code deployment
	 butler.Services : in source com.shephertz.app42.paas.MyCustomCode"}}
	     [java]     at com.shephertz.app42.paas.sdk.java.util.Util.multiPartRequest(
	Util.java:344)
	     [java]     at com.shephertz.app42.paas.sdk.java.customcode.CustomCodeServic
	e.deployJarFile(CustomCodeService.java:84)
	     [java]     at com.myapp.helper.AntHelper.upload(AntHelper.java:22)
	     [java]     at com.myapp.helper.AntHelper.main(AntHelper.java:30)