Delete request and Validation is not working getting error message

import com.eviware.soapui.support.XmlHolder
import com.eviware.soapui.impl.wsdl.testcase.WsdlTestRunContext

/* Secenrio is we are adding employee, getting employee details and checking or comparing weather whatever details we got with
get employee matches with addEmployee. */
/* Script is invoked with log,context and testRunner variable.
This is a heart of Groovy script, we are going to use these variable in our script */
log.info "welcome to learn groovy"
log.info context.expand('${#TestCase#name}')
log.info context.expand('${#TestCase#age}')
//to access or modify any property from another testcase then you have to come through its parent only
/* here scenerio is we define id in GetEmployee under custom property and want to access that
* which is possible through testRunner only and not with context
*/
//Project >> TestSuite >> TestCase >> TestStep Remember this hierarchy Parent to child and vicavarsa.
log.info testRunner.testCase.testSuite.testCases["GetEmployee"].getPropertyValue("id")
/*In above command first we move to testCase level then testSuite and then testCases(here we
* write testcases because with testCases we are able to access all testCases),
* but inthis case we need to access only one TC that i.e GetEmployee because we want id from it.
* After this we need to get property value i.e id which we will achive with the help of getPropertyValue.
*/
log.info testRunner.testCase.testSuite.testCases["AddEmployee"].getPropertyValue("age")
//in above age is under cuctom property of AddElployee
//Project >> TestSuite >> TestCase >> TestStep Remember this hierarchy Parent to child and vicavarsa.

log.info testRunner.testCase.getPropertyValue("dept")
//in above command dept is present in script it self so no need to go till parent

// now we want to access Request property which is present under custom of get under Teststep of GetEmployee
log.info testRunner.testCase.testSuite.testCases["GetEmployee"].testSteps["get"].getPropertyValue("Request")

// if you want to set address in AddEmployee custom property the you need to use setPropertyValue instead of getPropertyValue
//in below command log.info is not needed as we are setting the value.
//testRunner.testCase.testSuite.testCases["GetEmployee"].setPropertyValue("address", "Dreams Rhythm")
// if you want to set pincode in AddEmployee custom property the you need to use setPropertyValue instead of getPropertyValue
//testRunner.testCase.testSuite.testCases["GetEmployee"].setPropertyValue("pincode","411021")

//Now gender is define under custom property of Project i.e Automation let us see how to access it
def project=testRunner.testCase.testSuite.project
log.info project.getPropertyValue("gender")
/*in above command at first line, we store project i.e Automation path under one variable
* i.e project and then using that variable i.e project we got property value of gender i.e M. def is used to store valuse of variable
*/

// Hit addEmployee request with properties from testcase level and do E2E Testing
/* step 1: We need to pull XML request from AddEmployee customeproperties
* sep 2: Need to import XML holder pakage i.e import com.eviware.soapui.support.XmlHolder
* step 3: need to update XML with the help of XmlHolder
*/
def addReq=testRunner.testCase.testSuite.testCases["AddEmployee"].testSteps["add"].getPropertyValue("Request")
def name=testRunner.testCase.testSuite.testCases["AddEmployee"].getPropertyValue("name")
def id=testRunner.testCase.testSuite.testCases["AddEmployee"].getPropertyValue("id")
def dept=testRunner.testCase.testSuite.testCases["AddEmployee"].getPropertyValue("department")
def age=testRunner.testCase.testSuite.testCases["AddEmployee"].getPropertyValue("age")
def xmlAdd=new XmlHolder(addReq)//update XML with the help of XmlHolder
xmlAdd.setNodeValue("//typ:addEmployee/typ:name",name)
xmlAdd.setNodeValue("//typ:addEmployee/typ:id",id)
xmlAdd.setNodeValue("//typ:addEmployee/typ:Department",dept)
xmlAdd.setNodeValue("//typ:addEmployee/typ:age",age)
def newAddXml=xmlAdd.getXml()// it will save the XML with name, id, dept and age
//log info newAddXml //if you comment this command then you are able to see Xml in Popup

//now we are putting new Xml in AddEmployee
testRunner.testCase.testSuite.testCases["AddEmployee"].testSteps["add"].setPropertyValue("Request",newAddXml)

//now call the service
//to call the service one method is there WsdlTestRunContext i.e import com.eviware.soapui.impl.wsdl.testcase.WsdlTestRunContext
//context of AddEmployee testcase should be passed as Add step which we are trying to run belongs to that Testcase

def addTestStep=testRunner.testCase.testSuite.testCases["AddEmployee"].testSteps["add"]
def contextAddEmployee=new WsdlTestRunContext(addTestStep);

addTestStep.run(testRunner,contextAddEmployee)

// Hit getEmployee and generate response. Validate the response if it have the name which added in our earlier step.
def getReq=testRunner.testCase.testSuite.testCases["GetEmployee"].testSteps["get"].getPropertyValue("Request")
def getEmpxml=new XmlHolder(getReq)
getEmpxml.setNodeValue("//typ:getEmployeeDetails/typ:employeeName", name)
def newgetEmpxml=getEmpxml.getXml()// here we are saving xml and put it in one variable
testRunner.testCase.testSuite.testCases["GetEmployee"].testSteps["get"].setPropertyValue("Request",newgetEmpxml)
def getTestStep=testRunner.testCase.testSuite.testCases["GetEmployee"].testSteps["get"]; //we want to run the request
def contextGetEmployee=new WsdlTestRunContext(getTestStep);
getTestStep.run(testRunner,contextGetEmployee)

//Now we are validating the response which we got with GetEmployee and compare it with Request of AddEmployee so that we will do E2E testing.
def getRes=testRunner.testCase.testSuite.testCases["GetEmployee"].testSteps["get"].getPropertyValue("Response")
def getEmpres=new XmlHolder(getRes)
def Getresponse=getEmpres.getNodeValue("//ns:name")

log.info Getresponse
log.info name
assert Getresponse==name// it will compair the response of GetEmployee with request of AddEmployee

// delete request
def getRep=testRunner.testCase.testSuite.testCases["DeleteEmployee"].testSteps["delete"].getPropertyValue("Request")
def deleteEmpxml=new XmlHolder(getRep)
deleteEmpxml.setNodeValue("//typ:deleteEmployee/typ:employeeName", name)
def newdeleteEmpxml=deleteEmpxml.getXml()// here we are saving xml and put it in one variable
testRunner.testCase.testSuite.testCases["DeleteEmployee"].testSteps["delete"].setPropertyValue("Request",newdeleteEmpxml)
def deleteTestStep=testRunner.testCase.testSuite.testCases["DeleteEmployee"].testSteps["delete"]; //we want to run the request
def contextDeleteEmployee=new WsdlTestRunContext(deleteTestStep);
log.info deleteTestStep.run(testRunner,contextDeleteEmployee)

//validation
def getRes=testRunner.testCase.testSuite.testCases["DeleteEmployee"].testSteps["delete"].getPropertyValue("Response")
def deleteEmpres=new XmlHolder(getRes)
def Deleteresponse=deleteEmpres.getNodeValue("//ns:name")
log.info"Expected result is: " Deleteresponse//this is expected result
log.info "Actual result is: " name//this is Actual result
assert Deleteresponse==name