Performrequest: неожиданный код ответа 500

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Я пытаюсь узнать, как создать систему регистрации с помощью онлайн-базы данных phpMyAdmin для моего приложения для Android. Я использовал это это(https://000webhost.com) для предоставления онлайн-базы данных, и я продолжаю получать эту ошибку при запуске моего приложения. BasicNetwork.performRequest: неожиданный код ответа 500 для

мой RegisterActivity :

public class RegisterActivity extends AppCompatActivity {
    private static final String KEY_STATUS = "status";
    private static final String KEY_MESSAGE = "message";
    private static final String KEY_FULL_NAME = "full_name";
    private static final String KEY_EMAIL = "email";
    private static final String KEY_PASSWORD = "password";
    private static final String KEY_EMPTY = "";
    private EditText etEmail;
    private EditText etPassword;
    private EditText etConfirmPassword;
    private EditText etFullName;
    private String email;
    private String password;
    private String confirmPassword;
    private String fullName;
    private ProgressDialog pDialog;
    private String register_url = "https://xxx.000webhostapp.com/register.php";
    private SessionHandler session;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        session = new SessionHandler(getApplicationContext());
        setContentView(R.layout.activity_register);

        etEmail = findViewById(R.id.etEmail);
        etPassword = findViewById(R.id.etPassword);
        etConfirmPassword = findViewById(R.id.etConfirmPassword);
        etFullName = findViewById(R.id.etFullName);

        Button login = findViewById(R.id.btnRegisterLogin);
        Button register = findViewById(R.id.btnRegister);

        //Launch Login screen when Login Button is clicked
        login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent i = new Intent(RegisterActivity.this, LoginActivity.class);
                startActivity(i);
                finish();
            }
        });

        register.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //Retrieve the data entered in the edit texts
                email = etEmail.getText().toString().toLowerCase().trim();
                password = etPassword.getText().toString().trim();
                confirmPassword = etConfirmPassword.getText().toString().trim();
                fullName = etFullName.getText().toString().trim();
                if (validateInputs()) {
                    registerUser();
                }

            }
        });

    }

    /**
     * Display Progress bar while registering
     */
    private void displayLoader() {
        pDialog = new ProgressDialog(RegisterActivity.this);
        pDialog.setMessage("Signing Up.. Please wait...");
        pDialog.setIndeterminate(false);
        pDialog.setCancelable(false);
        pDialog.show();

    }

    /**
     * Launch Dashboard Activity on Successful Sign Up
     */
    private void loadDashboard() {
        Intent i = new Intent(getApplicationContext(), DashboardActivity.class);
        startActivity(i);
        finish();

    }

    private void registerUser() {
        displayLoader();
        JSONObject request = new JSONObject();
        try {
            //Populate the request parameters
            request.put(KEY_EMAIL, email);
            request.put(KEY_PASSWORD, password);
            request.put(KEY_FULL_NAME, fullName);

        } catch (JSONException e) {
            e.printStackTrace();
        }
        JsonObjectRequest jsArrayRequest = new JsonObjectRequest
                (Request.Method.POST, register_url, request, new Response.Listener<JSONObject>() {
                    @Override
                    public void onResponse(JSONObject response) {
                        pDialog.dismiss();
                        try {
                            //Check if user got registered successfully
                            if (response.getInt(KEY_STATUS) == 0) {
                                //Set the user session
                                session.loginUser(email,fullName);
                                loadDashboard();

                            }else if(response.getInt(KEY_STATUS) == 1){
                                //Display error message if email is already existsing
                                etEmail.setError("Email already taken!");
                                etEmail.requestFocus();

                            }else{
                                Toast.makeText(getApplicationContext(),
                                        response.getString(KEY_MESSAGE), Toast.LENGTH_SHORT).show();

                            }
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                    }
                }, new Response.ErrorListener() {

                    @Override
                    public void onErrorResponse(VolleyError error) {
                        pDialog.dismiss();

                        //Display error message whenever an error occurs
                        Toast.makeText(getApplicationContext(),
                                error.getMessage(), Toast.LENGTH_SHORT).show();

                    }
                });

        // Access the RequestQueue through your singleton class.
        MySingleton.getInstance(this).addToRequestQueue(jsArrayRequest);
    }

    /**
     * Validates inputs and shows error if any
     * @return
     */
    private boolean validateInputs() {
        if (KEY_EMPTY.equals(fullName)) {
            etFullName.setError("Full Name cannot be empty");
            etFullName.requestFocus();
            return false;

        }
        if (KEY_EMPTY.equals(email)) {
            etEmail.setError("Email cannot be empty");
            etEmail.requestFocus();
            return false;
        }
        if (KEY_EMPTY.equals(password)) {
            etPassword.setError("Password cannot be empty");
            etPassword.requestFocus();
            return false;
        }

        if (KEY_EMPTY.equals(confirmPassword)) {
            etConfirmPassword.setError("Confirm Password cannot be empty");
            etConfirmPassword.requestFocus();
            return false;
        }
        if (!password.equals(confirmPassword)) {
            etConfirmPassword.setError("Password and Confirm Password does not match");
            etConfirmPassword.requestFocus();
            return false;
        }

        return true;
    }
}

мой register.php:

<?php
$response = array();
include 'db/db_connect.php';
include 'functions.php';

//Get the input request parameters
$inputJSON = file_get_contents('php://input');
$input = json_decode($inputJSON, TRUE); //convert JSON into array

//Check for Mandatory parameters
if(isset($input['email']) && isset($input['password']) && isset($input['full_name'])){
    $email = $input['email'];
    $password = $input['password'];
    $fullName = $input['full_name'];

    //Check if user already exist
    if(!userExists($email)){

        //Get a unique Salt
        $salt         = getSalt();

        //Generate a unique password Hash
        $passwordHash = password_hash(concatPasswordWithSalt($password,$salt),PASSWORD_DEFAULT);

        //Query to register new user
        $insertQuery  = "INSERT INTO member(email, full_name, password_hash, salt) VALUES (?,?,?,?)";
        if($stmt = $con->prepare($insertQuery)){
            $stmt->bind_param("ssss",$email,$fullName,$passwordHash,$salt);
            $stmt->execute();
            $response["status"] = 0;
            $response["message"] = "User created";
            $stmt->close();
        }
    }
    else{
        $response["status"] = 1;
        $response["message"] = "User exists";
    }
}
else{
    $response["status"] = 2;
    $response["message"] = "Missing mandatory parameters";
}
echo json_encode($response);
?>

Что я уже пробовал:

проверьте информацию о моем подключении в poth my app и php сервисе

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