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activiti + drools , and I got the errors

Question asked by cjk_activiti on Sep 27, 2016
Latest reply on Dec 12, 2016 by gdharley
hi , I Use BusinessRuleTask in my process, It works well ,but when I query the taskVariables , get following error, can somebody help me?

org.activiti.engine.ActivitiException: Couldn't deserialize object in variable '${ir}'   
   at org.activiti.engine.impl.variable.SerializableType.deserialize(
   at org.activiti.engine.impl.variable.SerializableType.getValue(

and this is my config:
<businessRuleTask id="isSkipDraft" name="drool task" activiti:ruleVariablesInput="${ir}" activiti:rules="draft1,direct to reply" activiti:resultVariable="${ir}"></businessRuleTask>