Content-Length header already present

Hello,

I am Getting the below error:-

Error:com.sap.gateway.core.ip.component.odata.exception.OsciException: HTTP Request failed with error : executeUtil : failed with error. Message = null, cause: org.apache.http.ProtocolException: Content-Length header already present

I have created a integration flow in which i am storing the string value in the Property and later on the the Message Mapping function i am calling the script to match some data and the script is working and i am getting the result out from the Message Mapping and which the help of Request reply i am upserting the data to EC but at the time of upsert in am getting the Above error.

Please suggest