Unable to like a tweet using twitter4j but everything else is working fine

Question

Here is the code which is working fine for other methods of twitter variable but only createfavorite is giving this error :

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import twitter4j.TwitterFactory;
import twitter4j.conf.ConfigurationBuilder;


public class TwitterAutoLikerPart1 {
    private static Logger logger = LoggerFactory.getLogger(TwitterAutoLikerPart1.class);

    public static void main(String[] args) throws Exception {
  
        ConfigurationBuilder cb = new ConfigurationBuilder();
        cb.setDebugEnabled(true)
                .setOAuthConsumerKey("E")
                .setOAuthConsumerSecret("F")
                .setOAuthAccessToken("G")
                .setOAuthAccessTokenSecret("H");

        TwitterFactory tf = new TwitterFactory(cb.build());
        var twitter = tf.getInstance();
        long tweetid=tweetid;
        logger.info("Tweet id is "+tweetid);
        logger.info(twitter.createFavorite(tweetid).getText());
       /*
Whereas this is working 
 for(var x:twitter.getFavorites())
            logger.info(x.toString());*/

    }


}

Here's the logs for your referrence :

Exception in thread "main" 401:Authentication credentials (https://dev.twitter.com/pages/auth) were missing or incorrect. Ensure that you have set valid consumer key/secret, access token/secret, and the system clock is in sync.
{"request":"\/1.1\/favorites\/create.json","error":"Read-only application cannot POST."}

Relevant discussions can be found on the Internet at:
    http://www.google.co.jp/search?q=038fb9e8 or
    http://www.google.co.jp/search?q=480cbeca
TwitterException{exceptionCode=[038fb9e8-480cbeca], statusCode=401, message=null, code=-1, retryAfter=-1, rateLimitStatus=null, version=4.0.7}
    at twitter4j.HttpClientImpl.handleRequest(HttpClientImpl.java:170)
    at twitter4j.HttpClientBase.request(HttpClientBase.java:57)
    at twitter4j.HttpClientBase.post(HttpClientBase.java:86)
    at twitter4j.TwitterImpl.post(TwitterImpl.java:2102)
    at twitter4j.TwitterImpl.createFavorite(TwitterImpl.java:1241)
    at com.twiiterapi.mt.twitterapi.TwitterAutoLikerPart1.main(TwitterAutoLikerPart1.java:30)

Process finished with exit code 1

Kindly let me know where am I faultering.

Edit: So, the issue was app permission as pointed by the kind person Mr Andy Piper . I changed the permission and it started working like a charm .