Unable to read error response of fb plugin share

Question

I am using cordova-plugin-facebook4 version 1.7.4 for facebook share in my app. I got an error while sharing one post to facebook.

{errorMessage : "Facebook error: {FacebookServiceException: httpResponseCode: -1, facebookErrorCode: 190, facebookErrorType: null, message: Error validating access token: The user has not authorized application XXXXXXXX.}" }

From the facebook docs, I came to know that this error occurs when user de-authorizes my app. So I want to login again and obtain a new access token.

In the Facebook docs, I came to know that facebook sends error code 190 when this error occurs. I am able to see the facebookErrorCode field in my error response.

My problem is I am unable to parse the error response to get the facebook error code. I tried few JSON parse and JSON stringify methods. But nothing worked. I am unable to obtain the error code.

Can anyone help me in parsing the error response and getting the error code ?

UPDATE

Here is my code sample

facebookConnectPlugin.showDialog( 
            { method: "share_open_graph",
                action: 'og.likes',
                object: JSON.stringify({
                  object:'https://developers.facebook.com/docs/',
              })
            }, 
            function (response) { 
                console.log(JSON.stringify(response)); 
                DialogService.showToast('FB_SHARE_SUCCESS', 'Short', 'Bottom');
                
            },
            function (response) { 
                console.log('share failed. ',response);
                if(response.errorMessage.facebookErrorCode == 190){
                    fblogin.then(
                        function(response){
                            share();
                        },
                        function(error){
                            //
                        }
                    )
                }else{
                    DialogService.showToast('FB_SHARE_FAILED', 'Short', 'Bottom');
                } 
                
            }
        );

I am able to post to facebook if the user authorizes the app for posting. If the user de-authorizes, I am unable to capture the error code 190.