Uploading images from gallery to S3 AWS android

I really tried all the links before asking here. I don't know what to do, I googled everything and tried many different ways and nothing is working.

I think the problem is in the file string path. Here is my Main code:

package com.android.dji.eaglei;

import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

import com.amazonaws.auth.CognitoCachingCredentialsProvider;
import com.amazonaws.mobileconnectors.s3.transferutility.TransferListener;
import com.amazonaws.mobileconnectors.s3.transferutility.TransferObserver;
import com.amazonaws.mobileconnectors.s3.transferutility.TransferState;
import com.amazonaws.mobileconnectors.s3.transferutility.TransferUtility;
import com.amazonaws.regions.Region;
import com.amazonaws.regions.Regions;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3Client;
import com.amazonaws.services.s3.model.Tag;

import java.io.File;

public class MainActivity extends AppCompatActivity {

    //for image upload
    private ImageView imageView;
    private Button button;
    private static final int PICK_IMAGE = 1;
    private Uri imageUri;
    String imageName = "newTest.jpg";
    private Button upload;
    //

    // for aws
    String bucket = "eagleibucket";
    File fileToUpload ;
    AmazonS3 s3;
    TransferUtility transferUtility;
    //
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // callback method to call credentialsProvider method.
        credentialsProvider();
        // callback method to call the setTransferUtility method
        setTransferUtility();

        //uploading image
        imageView = (ImageView) findViewById(R.id.imageView);
        button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                openGallery();
            }
        });
        upload = (Button) findViewById(R.id.upload);
        upload.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                setTransferUtility();
                setFileToUpload(v);
            }
        });
    }
    protected  void  openGallery(){
        Intent gallery = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
        startActivityForResult(gallery,PICK_IMAGE);
    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        try {
            if (resultCode == RESULT_OK && requestCode == PICK_IMAGE) {
                imageUri = data.getData();
                imageView.setImageURI(imageUri);
                // aws uri img to upload
                imageName = (String) imageView.getTag();
                imageUri = data.getData();
                imageView.setImageURI(imageUri);




            } else {
                Toast.makeText(this, "You haven't picked an image", Toast.LENGTH_LONG).show();
            }
        } catch (Exception e) {
            Toast.makeText(this, "Something went wrong!", Toast.LENGTH_LONG).show();
        }
    }
    public void credentialsProvider(){

        // Initialize the Amazon Cognito credentials provider
        CognitoCachingCredentialsProvider credentialsProvider = new CognitoCachingCredentialsProvider(
                getApplicationContext(),
                "us-west-2:edb44a70-b31e-44b0-b8c7-2d38a9c7c98f", // Identity pool ID
                Regions.US_WEST_2 // Region
        );
        setAmazonS3Client(credentialsProvider);
    }
    /**
     *  Create a AmazonS3Client constructor and pass the credentialsProvider.
     * @param credentialsProvider
     */
    public void setAmazonS3Client(CognitoCachingCredentialsProvider credentialsProvider){
        // Create an S3 client
        s3 = new AmazonS3Client(credentialsProvider);
        // Set the region of your S3 bucket
        s3.setRegion(Region.getRegion(Regions.US_WEST_2));
    }
    public void setTransferUtility(){
        transferUtility = new TransferUtility(s3, getApplicationContext());
    }
    /**
     * This method is used to upload the file to S3 by using TransferUtility class
     * @param view
     */
    public void setFileToUpload(View view){
        fileToUpload = new File(getRealPathFromURI(imageUri));
        if (fileToUpload == null) {
            Toast.makeText(this, "Could not find the filepath of  the selected file", Toast.LENGTH_LONG).show();
                    // to make sure that file is not emapty or null
            return;
        }
        TransferObserver transferObserver = transferUtility.upload(
                bucket,
                imageName,
                fileToUpload
        );
        transferObserverListener(transferObserver);
    }
    /**
     * This is listener method of the TransferObserver
     * Within this listener method, we get status of uploading and downloading file,
     * to display percentage of the part of file to be uploaded or downloaded to S3
     * It displays an error, when there is a problem in  uploading or downloading file to or from S3.
     * @param transferObserver
     */
    public void transferObserverListener(TransferObserver transferObserver){
        transferObserver.setTransferListener(new TransferListener(){
            @Override
            public void onStateChanged(int id, TransferState state) {
                Toast.makeText(getApplicationContext(), "State Change" + state,
                        Toast.LENGTH_SHORT).show();
            }
            @Override
            public void onProgressChanged(int id, long bytesCurrent, long bytesTotal) {
                int percentage = (int) (bytesCurrent/bytesTotal * 100);
                Toast.makeText(getApplicationContext(), "Progress in %" + percentage,
                        Toast.LENGTH_SHORT).show();
            }
            @Override
            public void onError(int id, Exception ex) {
                Log.e("error","error");
            }
        });
    }
    private String getRealPathFromURI(Uri contentURI) {
        String thePath = "no-path-found";
        String[] filePathColumn = {MediaStore.Images.Media.DISPLAY_NAME};
        Cursor cursor = getContentResolver().query(contentURI, filePathColumn, null, null, null);
        if(cursor.moveToFirst()){
            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
            thePath = cursor.getString(columnIndex);
        }
        cursor.close();
        return  thePath;
    }
}

Manifest: I added the permissions as well as the service. I also added the needed libraries.

This is the Error:

E/AndroidRuntime: FATAL EXCEPTION: main Process: com.android.dji.eaglei, PID: 
        java.lang.IllegalArgumentException: Invalid file: 
            at com.amazonaws.mobileconnectors.s3.transferutility.TransferUtility.upload(TransferUtility.java:478)
            at com.amazonaws.mobileconnectors.s3.transferutility.TransferUtility.upload(TransferUtility.java:443)
            at com.amazonaws.mobileconnectors.s3.transferutility.TransferUtility.upload(TransferUtility.java:412)
            at com.amazonaws.mobileconnectors.s3.transferutility.TransferUtility.upload(TransferUtility.java:353)
            at com.android.dji.eaglei.MainActivity.setFileToUpload(MainActivity.java:134)
            at com.android.dji.eaglei.MainActivity$2.onClick(MainActivity.java:70)
            at android.view.View.performClick(View.java:5716)
            at android.widget.TextView.performClick(TextView.java:10926)
            at android.view.View$PerformClick.run(View.java:22596)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:148)
            at android.app.ActivityThread.main(ActivityThread.java:7331)
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

Thanks for the help!