Uncaught Error: Class 'Instamojo\Exception\InstamojoException' not found

Question

     $authType = "app/user";
     $api = Instamojo\Instamojo::init($authType,[
     "client_id" =>  'XXXXXQAZ',
     "client_secret" => 'XXXXQWE',
     ],true);
     try {
     $response = $api->createPaymentRequest(array(
        "purpose" => "FIFA 16",
        "amount" => $_POST["amount"],
        "buyer_name" => $_POST["name"],
        "send_email" => true,
        "email" => $_POST["email"],
        "phone" => $_POST["phone"],
        "redirect_url" =>"http://localhost/instamojo/payment-                                   success.php"
        ));
        var_dump($response);
         }
         catch (Exception $e) {
         print('Error: ' . $e->getMessage());
          };

I am trying to integrate instamojo in my project for transaction purpose but getting this error. tried a lot but was not able to solve this issue. help is really appreciated. Thanks in advance.

I update the composer and also removed the throw new InvalidRequestException from final class Instamojo and the issue still persist.

And this is part the which is causing issue this file comes with when a downloaded instamojo through composer

    private static function validateTypeParams($type, $params)
{
    if (!in_array(strtolower($type), Instamojo::VALID_TYPES)) {
        throw new InvalidRequestException('Invalid init type');
    }

    if (empty($params['client_id'])) {
        throw new MissingParameterException('Client Id is missing');
    }

    if (empty($params['client_secret'])) {
        throw new MissingParameterException('Client Secret is missing');
    }

    if (strtolower($type) == 'user') {
        if (empty($params['username'])) {
            throw new MissingParameterException('Username is missing');
        }

        if (empty($params['password'])) {
            throw new MissingParameterException('Password is missing');
        }
    }
};

Answer 1

change code for class InvalidRequestException

<?php

namespace Instamojo\Exception;

use Exception;

class InstamojoException extends Exception {
    private $httpErrorCode;
    private $errorNumber;
    private $errorMessage;
    
    public function __construct($httpErrorCode, $errorNumber, $errorMessage) {
        parent::__construct ($errorMessage);

        $this->httpErrorCode = $httpErrorCode;
        $this->errorNumber   = $errorNumber;
        $this->errorMessage  = $errorMessage;
    }

    public function getHttpErrorCode() {
        return $this->httpErrorCode;
    }
    
    public function getErrorNumber() {
        return $this->errorNumber;
    }
    
    public function getErrorMessage() {
        return $this->errorMessage;
    }
}

class InvalidRequestException extends InstamojoException {
    public function __construct($errorMessage) {
        parent::__construct (null, null, $errorMessage);
    }
}