swaggerui Undocumented Error: OK

I have downloaded Redux DevTools for Developers and I did manage to find the issue with the code. After fixing the code, the problem got resolved and I was able to load the image into the swaggerui.

Error spotted using Redux DevTools:

oldCode:

        <script>
          window.onload = function() {
            var appKey = '';
            var idToken = '';
            var accessToken = '';
            var replaceAppKey = false;
            const ui = SwaggerUIBundle({
              url: Drupal.settings.nsw_theme.swagger_url,
              dom_id: '#tryit',
              displayRequestDuration: true,
              withCredentials: true,
              filter: true,
              showExtensions: true,
              showCommonExtensions: true,
              validatorUrl: "https://validator.swagger.io/validator",
              presets: [
                SwaggerUIBundle.presets.apis,
                SwaggerUIStandalonePreset
              ],
              parameterMacro: function (operation, parameter) {
                if((parameter.name == "X-API-Key" || 
                    parameter.name == "apikey"    ||
                    parameter.name == "x-apikey") && replaceAppKey) {
                  parameter.example = appKey;
                }else if(parameter.name == "X-Id-Token") {
                  parameter.example = idToken;
                }else if(parameter.name == "X-Access-Token") {
                  parameter.example = accessToken;
                }
              },
              onComplete: function(swaggerApi, swaggerUi) {
              // "ApiKeyAuth" is the key name of the security scheme in securityDefinitions
                 var result = getApiKey();
                 if(result.httpStatusCode == 200 && result.appKey != ""){
                     appKey = result.appKey;
                     appName = result.appName;
                     Swal.fire({
                       title: 'Replace App key?',
                       text: 'We found that one of your Apps (' + appName + ') have access to this API Product. We can replace all App keys in the OpenAPI Specs with your App Key.',
                       icon: 'question',
                       showCancelButton: true,
                       confirmButtonColor: '#3085d6',
                       cancelButtonColor: '#d33',
                       confirmButtonText: 'Yes, replace it!'
                     }).then((result) => {
                       if (result.value) {
                         ui.preauthorizeApiKey("ApiKeyAuth", appKey);
                         replaceAppKey = true;
                         Swal.fire(
                           'Replaced!',
                           'All App keys have been replaced in the current OpenAPI specs.',
                           'success'
                         )
                       }
                     });
                 }else{
                   if(result.httpStatusCode != 200){
                     Swal.fire({
                       icon: 'error',
                       title: 'Oops...' + result.httpStatusCode,
                       html: result.message,
                       footer: '<a href="/help">Why do I have this issue?</a>'
                     }); 
                   }
                 }
              },
              requestInterceptor: function (request) {
                  var headers = request.headers || {};
                  if (headers["X-Id-Token"]) {
                     headers["X-Id-Token"] = idToken;
                  }else if(headers["client_id"]) {
                     headers["client_id"] = accessToken;
                  }
                  return request;
              },
              responseInterceptor: function (response) {
                  var headers = response.headers || {};
                  if (response.obj.IdToken) {
                     idToken = response.obj.IdToken;
                  }else if(response.obj.id_token) {
                     idToken = response.obj.id_token;
                  }
                  if (response.obj.AccessToken) {
                     accessToken = response.obj.AccessToken;
                  }else if(response.obj.access_token) {
                     accessToken = response.obj.access_token;
                  }
                  return response;
              }
            })

            window.ui = ui
          }
          
        function getApiKey() {
          "use strict";
          var domainName = window.location.hostname;
          var apiPath = "/app/developer_apps/app.json";
          var apiURI = "https://test:test@" + domainName + apiPath;
          var apiMethod = "GET";
          var httpStatusCode = "";
          var message = "";
          var appName = "";
          var appKey = "";
          var appSecret = "";
          		
          jQuery.ajax({
            async: false,
            type: apiMethod,
            url: apiURI,
            dataType: "json",
            statusCode: {
              200: function(responseData) {
                     httpStatusCode = "200";
                     message = "Retrieved LoggedIn user summary list of Apps successfully";
                   },
              204: function(responseData) {
                     httpStatusCode = "204";
                     message = `Retrieved LoggedIn user summary list of Apps is empty
                                Please create an App to be able to experience what this API
                                product can offer`;
                   },
              401: function(responseData) {
                     httpStatusCode = "401";
                     message = `Unable to retrieved LoggedIn user summary list of Apps.
                                If you want, you can <a href="https://developer-dev.testservicensw.net/user/login">login</a> so that you can experience what this API
                                product can offer to your App; otherwise just click Ok`;
                   },
              403: function(responseData) {
                     httpStatusCode = "403";
                     message = "Received unauthorized while trying to retrieved LoggedIn user summary list of Apps";
                   },
              404: function(responseData) {
                     httpStatusCode = "404";
                     message = "Received resource not found while trying to retrieved LoggedIn user summary list of Apps";
                   }
              },
              error: function(responseData){
                   httpStatusCode = responseData.status;
                   message = "Received unknown error";
              },
              }).done(function(responseData){
                  if(httpStatusCode == 200) {
                     jQuery.each(responseData, function(index, value) {
                       var dotIndex = Drupal.settings.nsw_theme.swagger_file_name.indexOf(".");
                       var apiProductName = Drupal.settings.nsw_theme.swagger_file_name.substring(0, dotIndex);
                       if(apiProductName.toLowerCase() === value.apiProducts[0].toLowerCase()){
                         appName = value.appName;
                         appKey = value.consumerKey;
                         appSecret = value.consumerSecret;
                       }else{
                         message = "Couldn't find a product match in your list of apps";

                       }
                     });
          	  }
              });
              return {
                      "httpStatusCode": httpStatusCode, 
                      "message": message, 
                      "appName": appName, 
                      "appKey": appKey, 
                      "appSecret": appSecret
              };
          }          
        </script>

        <!--
         *
         * End of Swagger UI Configuration
         * -------------------------------
         *
         -->

NEWCode:
The section that was changed was the responseInterceptor section

        <script>
          window.onload = function() {
            var appKey = '';
            var idToken = '';
            var accessToken = '';
            var replaceAppKey = false;
            const ui = SwaggerUIBundle({
              url: Drupal.settings.nsw_theme.swagger_url,
              dom_id: '#tryit',
              displayRequestDuration: true,
              withCredentials: true,
              filter: true,
              showExtensions: true,
              showCommonExtensions: true,
              validatorUrl: "https://validator.swagger.io/validator",
              presets: [
                SwaggerUIBundle.presets.apis,
                SwaggerUIStandalonePreset
              ],
              parameterMacro: function (operation, parameter) {
                if((parameter.name == "X-API-Key" || 
                    parameter.name == "apikey"    ||
                    parameter.name == "x-apikey") && replaceAppKey) {
                  parameter.example = appKey;
                }else if(parameter.name == "X-Id-Token") {
                  parameter.example = idToken;
                }else if(parameter.name == "X-Access-Token") {
                  parameter.example = accessToken;
                }
              },
              onComplete: function(swaggerApi, swaggerUi) {
              // "ApiKeyAuth" is the key name of the security scheme in securityDefinitions
                 var result = getApiKey();
                 if(result.httpStatusCode == 200 && result.appKey != ""){
                     appKey = result.appKey;
                     appName = result.appName;
                     Swal.fire({
                       title: 'Replace App key?',
                       text: 'We found that one of your Apps (' + appName + ') have access to this API Product. We can replace all App keys in the OpenAPI Specs with your App Key.',
                       icon: 'question',
                       showCancelButton: true,
                       confirmButtonColor: '#3085d6',
                       cancelButtonColor: '#d33',
                       confirmButtonText: 'Yes, replace it!'
                     }).then((result) => {
                       if (result.value) {
                         ui.preauthorizeApiKey("ApiKeyAuth", appKey);
                         replaceAppKey = true;
                         Swal.fire(
                           'Replaced!',
                           'All App keys have been replaced in the current OpenAPI specs.',
                           'success'
                         )
                       }
                     });
                 }else{
                   if(result.httpStatusCode != 200){
                     Swal.fire({
                       icon: 'error',
                       title: 'Oops...' + result.httpStatusCode,
                       html: result.message,
                       footer: '<a href="/help">Why do I have this issue?</a>'
                     }); 
                   }
                 }
              },
              requestInterceptor: function (request) {
                  var headers = request.headers || {};
                  if (headers["X-Id-Token"]) {
                     headers["X-Id-Token"] = idToken;
                  }else if(headers["client_id"]) {
                     headers["client_id"] = accessToken;
                  }
                  if (headers["Use-Proxy"]) {
                     if (headers["Use-Proxy"] != "") {
                         request.url = headers["Use-Proxy"] + "?url=" + request.url;
                         headers["Use-Proxy"] = "";
                     }
                  }
                  return request;
              },
              responseInterceptor: function (response) {
                  var headers = response.headers || {};
                  if (response.obj) {
                     if ("IdToken" in response.obj) {
                        idToken = response.obj.IdToken;
                     }else if(response.obj.id_token) {
                        idToken = response.obj.id_token;
                     }
                     if (response.obj.AccessToken) {
                        accessToken = response.obj.AccessToken;
                     }else if(response.obj.access_token) {
                        accessToken = response.obj.access_token;
                     }
                  }
                  return response;
              }
            })

            window.ui = ui
          }
          
        function getApiKey() {
          "use strict";
          var domainName = window.location.hostname;
          var apiPath = "/app/developer_apps/app.json";
          var apiURI = "https://test:test@" + domainName + apiPath;
          var apiMethod = "GET";
          var httpStatusCode = "";
          var message = "";
          var appName = "";
          var appKey = "";
          var appSecret = "";
          		
          jQuery.ajax({
            async: false,
            type: apiMethod,
            url: apiURI,
            dataType: "json",
            statusCode: {
              200: function(responseData) {
                     httpStatusCode = "200";
                     message = "Retrieved LoggedIn user summary list of Apps successfully";
                   },
              204: function(responseData) {
                     httpStatusCode = "204";
                     message = `Retrieved LoggedIn user summary list of Apps is empty
                                Please create an App to be able to experience what this API
                                product can offer`;
                   },
              401: function(responseData) {
                     httpStatusCode = "401";
                     message = `Unable to retrieved LoggedIn user summary list of Apps.
                                If you want, you can <a href="https://developer-dev.testservicensw.net/user/login">login</a> so that you can experience what this API
                                product can offer to your App; otherwise just click Ok`;
                   },
              403: function(responseData) {
                     httpStatusCode = "403";
                     message = "Received unauthorized while trying to retrieved LoggedIn user summary list of Apps";
                   },
              404: function(responseData) {
                     httpStatusCode = "404";
                     message = "Received resource not found while trying to retrieved LoggedIn user summary list of Apps";
                   }
              },
              error: function(responseData){
                   httpStatusCode = responseData.status;
                   message = "Received unknown error";
              },
              }).done(function(responseData){
                  if(httpStatusCode == 200) {
                     jQuery.each(responseData, function(index, value) {
                       var dotIndex = Drupal.settings.nsw_theme.swagger_file_name.indexOf(".");
                       var apiProductName = Drupal.settings.nsw_theme.swagger_file_name.substring(0, dotIndex);
                       if(apiProductName.toLowerCase() === value.apiProducts[0].toLowerCase()){
                         appName = value.appName;
                         appKey = value.consumerKey;
                         appSecret = value.consumerSecret;
                       }else{
                         message = "Couldn't find a product match in your list of apps";

                       }
                     });
          	  }
              });
              return {
                      "httpStatusCode": httpStatusCode, 
                      "message": message, 
                      "appName": appName, 
                      "appKey": appKey, 
                      "appSecret": appSecret
              };
          }          
        </script>

        <!--
         *
         * End of Swagger UI Configuration
         * -------------------------------
         *
         -->

        </div>

Result after fixing the code: