title: quickblox login authentication error in swift
body: <p>i am able to sign up but unble to log in in swift. </p>
  
  <pre><code>@IBAction func loginUser(_ sender : UIButton){
  
  
      QBRequest.logIn(withUserLogin: txtUserName.text!, password: txtPassword.text!, successBlock: { (response, user) in
           print("created user ::::",user)
      }) { (error) in
           print("created error")
      }
  
      }
  </code></pre>
  
  <p>i am getting below error.</p>
  
  <pre><code> error: Request failed: unauthorized (401)
      reasons: {
          errors =     (
              "Unauthorized"
          );
      }
  </code></pre>