Errors in PI during IDOC transmission with ECC backend systems

Hi Team,

We are getting an error in PI during IDOC transmission to DV2 and QSB. This error occurs irrespective of the IDOC type and interface. It looks like a System error as all the below messages are related to java.lang.NullPointerException. Could you please check?  

IDoc: Adding control record to payload failed due to Error during transform: java.lang.NullPointerException: while trying to invoke the method java.lang.String.length() of an object loaded from local variable chars

MP: exception caught with message Error during transform: java.lang.NullPointerException: while trying to invoke the method java.lang.String.length() of an object loaded from local variable 'chars'

Exception caught by adapter framework: Error during transform: java.lang.NullPointerException: while trying to invoke the method java.lang.String.length() of an object loaded from local variable 'chars'

Transmitting the message to endpoint <local> using connection SFTP_http://sap.com/xi/XI/SFTP failed, due to: com.sap.engine.interfaces.messaging.api.exception.MessagingException: java.lang.Exception: Error during transform: java.lang.NullPointerException: while trying to invoke the method java.lang.String.length() of an object loaded from local variable 'chars'

Thanks,

Sankar Bavirisetti