ios – Log In logic, for logging in if the email is verified doesnt work even for verified emails

In register Im verifiying email and going to my account. When i log in with same email that is verified, it will say Invalid Credentials

In register Im verifiying email and going to my account. When i log in with same email that is verified, it will say Invalid Credentials, this is the method

func userLoginApiHit(){

DispatchQueue.main.async {
    CommonFunctions.startProgressView(view: self.view)
}


let parameters = "{\n    \"email\": \"\(emailTxtffld.text!)\",\n    \"password\":\"\(passwrdTxtfld.text!)\"\n}"
let postData = parameters.data(using: .utf8)

var request = URLRequest(url: URL(string: "API")!,timeoutInterval: Double.infinity)
request.addValue("application/json", forHTTPHeaderField: "Content-Type")

request.httpMethod = "POST"
request.httpBody = postData

let task = URLSession.shared.dataTask(with: request) { data, response, error in
    
    DispatchQueue.main.async {
        CommonFunctions.dismissProgressView(view: self.view)
    }
    
  guard let data = data else {
    print(String(describing: error))
    return
  }
    
  print(String(data: data, encoding: .utf8)!)
    
    let json = JSON(data: data)
    print("json response \(json)")
                   
    if json == "Invalid Credentials" {
        DispatchQueue.main.async {
            CommonFunctions.showAlert(self, message: "Invalid Credentials", title: appName)
        }
    }
    else {
        DataManager.CurrentUserID = String(json["id"].intValue)
        objUser.parseUserData(responseDict: json)
        
        DispatchQueue.main.async {
            let vc = Storyboard.instantiateViewController(withIdentifier: "TabBarViewController") as! TabBarViewController
            self.navigationController?.pushViewController(vc,animated: true)
        }
    }
    
}

task.resume()

}