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[SAPUI5] Parse error message

If the error response is type json:

        oModel.callFunction("/myEntity", {
          method: "GET",
          urlParameters: {
            ID: myID,
          },
          success: oData => console.log(oData),
          error: oError => MessageBox.error(JSON.parse(oError.responseText).error.message.value, { title: "An error occurred" })
        });

If the error response is coming from a Gateway and has an XML body (link):

 MessageBox.error(jQuery.parseXML(oError.response.body).querySelector("message").textContent)

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