Failed Login Session with Twitter Connect Plugin in Ionic 3

I have integrated twitter-connect-plugin in my app with firebase. I have followed this tutorial for setting up the twitter with firebase in my Ionic 3 application.

In my config.xml:

 <preference name="TwitterConsumerKey" value="****************" />
 <preference name="TwitterConsumerSecret" value="*************" />
<plugin name="twitter-connect-plugin" spec="^0.6.0">
        <variable name="FABRIC_KEY" value="*******************" />
</plugin>

In my package.json:

	  "@ionic-native/twitter-connect": "^4.19.0",
	  "twitter-connect-plugin": "^0.6.0",
	   "twitter-connect-plugin": {
        "FABRIC_KEY": "****************"
      }

It was working perfectly fine but now it’s showing Failed Login Session error in the console.

What’s the problem here?

preference name=“TwitterConsumerKey” value=“twitter key” />
preference name=“TwitterConsumerSecret” value=“twitter secret” />

add this to config.xml