[jbpm-dev] problem with json array

Hi, I am a newbie to Jbpm. I am trying to write a HelloWorld kind of program in Jbpm. It works properly, but when i pass a json input file which contains some json array, then , my jbpm cribs about some varibale issue: * org.hibernate.HibernateException: Unable to resolve entity name from Class [org.jbpm.pvm.internal.type.variable.UnpersistableVariable] expected instance/subclass of [org.jbpm.pvm.internal.type.Variable]* * * The iput json i am passing is some like: { "a":"b", "some.var" : [ { ..... }, { ..... } ] } when i remove "some.var" (json array) from input json config, it again works properly. any help on this would be greatly appreciated. Thanks in advance, Souri