not found in bean: org.apache.camel.converter.stream.InputStreamCache

Question

Have a below script , which is throwing an error :

 .log("message: ${body}")
   //message: {"caListID":88186,"ciqWatchListID":706596203}
   .setHeader(KafkaConstants.KEY, simple("${body[caListID]}"))            
    .log("message: ${body[caListID]}")

Error :

Caused by: java.lang.IndexOutOfBoundsException: Key: caListID not found in bean: org.apache.camel.converter.stream.InputStreamCache@686300b6 of type: org.apache.camel.converter.stream.InputStreamCache using OGNL path [[caListID]]