Display backend error message after Create call - error-handling

Question

In my controller I have the following code - The problem is when it is error, I want to display exact error that is being passed from backend. But in my error handling function I never get any data. What is wrong here?
Controller.js
var token = null;
$.ajax({
url: sServiceURl,
type: "GET",
async: true,
beforeSend: function(xhr) {
sap.ui.core.BusyIndicator.show(0);
xhr.setRequestHeader("X-CSRF-Token", "Fetch");
},
complete: function(xhr) {
token = xhr.getResponseHeader("X-CSRF-Token");
oContext.OdataModel.create("/materialsSet", oContext.Data, null, oContext.submitSuccess.bind(oContext), oContext.submitError.bind(oContext));
}
});
submitSuccess: function(data, response, oContext) {
// works fine
},
submitError: function(oError) {
// I never get anything in oError, so the below code is useless.
try {
if (oError.responseText) {
obj = JSON.parse(oError.responseText);
message = obj.error.message.value;
} else if (oError.response.body) {
var errorModel = new sap.ui.model.xml.XMLModel();
errorModel.setXML(oError.response.body);
//Read message node
if (errorModel.getProperty("/0/message") !== "") {
message = errorModel.getProperty("/0/message");
} else {
message = message1;
}
} else {
message = message1;
}
} catch (error) {
message = message1;
}
sap.m.MessageToast.show(message);
},

Answer 1

Hope this will help you, first of all check backend response. I have use the below code for error handling.
submitError: function(responseBody) {
try {
var body = JSON.parse(responseBody);
var errorDetails = body.error.innererror.errordetails;
if (errorDetails) {
if (errorDetails.length > 0) {
for (i = 0; i < errorDetails.length; i++) {
console.log(errorDetails[i].message);
}
} else
console.log(body.error.message.value);
} else
console.log(body.error.message.value);
} catch (err) {
try {
//the error is in xml format. Technical error by framework
switch (typeof responseBody) {
case "string": // XML or simple text
if (responseBody.indexOf("<?xml") > -1) {
var oXML = jQuery.parseXML(responseBody);
var oXMLMsg = oXML.querySelector("message");
if (oXMLMsg)
console.log(oXMLMsg.textContent);
} else
console.log(responseBody);
break;
case "object": // Exception
console.log(responseBody.toString());
break;
}
} catch (err) {
console.log("common error message");
}
}
}