W/System.err: com.parse.ParseRequest$ParseRequestException: schema mismatch for Tweet.Amitabh; expected Array but got String

this is the code for updating the value of the key "Amithabh" but the put method is giving error. The add and remove methods are working properly. The server is fine connected

package com.example.androidparse;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.util.Log;

import com.parse.GetCallback;
import com.parse.ParseException;
import com.parse.ParseInstallation;
import com.parse.ParseObject;
import com.parse.ParseQuery;
import com.parse.SaveCallback;


public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        ParseQuery<ParseObject> query = ParseQuery.getQuery("Tweet");
        query.getInBackground("qDGilscXDH", new GetCallback<ParseObject>() {
            @Override
            public void done(ParseObject object, ParseException e) {
                if(e == null){
//                    object.add("Amitabh","KBC");
                    object.put("Amitabh","kbc");
                    object.saveInBackground(new SaveCallback() {
                        @Override
                        public void done(ParseException e) {
                            e.printStackTrace();
                        }
                    });

                    Log.i("string",object.get("Amitabh").toString());
                    Log.i("success","saved succesfull");
                }else{
                    Log.i("not saved",e.getStackTrace().toString());
                }
            }
        });

        ParseInstallation.getCurrentInstallation().saveInBackground();
    }
}

the code to update value at parse server

Output error

W/System.err: com.parse.ParseRequest$ParseRequestException: schema mismatch for Tweet.Amitabh; expected Array but got String
W/System.err:     at com.parse.ParseRequest.newPermanentException(ParseRequest.java:268)
        at com.parse.ParseRESTCommand.onResponseAsync(ParseRESTCommand.java:302)
        at com.parse.ParseRequest$3.then(ParseRequest.java:134)
W/System.err:     at com.parse.ParseRequest$3.then(ParseRequest.java:130)
        at com.parse.boltsinternal.Task$15.run(Task.java:907)
        at com.parse.boltsinternal.BoltsExecutors$ImmediateExecutor.execute(BoltsExecutors.java:113)
W/System.err:     at com.parse.boltsinternal.Task.completeAfterTask(Task.java:898)
        at com.parse.boltsinternal.Task.continueWithTask(Task.java:713)
        at com.parse.boltsinternal.Task.continueWithTask(Task.java:724)
W/System.err:     at com.parse.boltsinternal.Task$13.then(Task.java:816)
        at com.parse.boltsinternal.Task$13.then(Task.java:804)
W/System.err:     at com.parse.boltsinternal.Task$15.run(Task.java:907)
W/System.err:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
W/System.err:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
        at java.lang.Thread.run(Thread.java:761)

error output