Cannot send SOAP Request through Katalon


When i am trying to send the SOAP request using WSDL url , I am getting the below error -
at com.kms.katalon.core.webservice.common.SoapClient.send(
at com.kms.katalon.controller.WebServiceController.sendRequest(
at org.eclipse.jface.operation.ModalContext$
Caused by: java.lang.NullPointerException

Can you please help me to resolve this issue and let me know if any workaround. I am able to Load the service functions from WSDL but cannot send the request.