Jwt Authentication error Argument 3 passed to Lcobucci\JWT\Signer\Hmac::doVerify()

Question

I'm working on a project to learn laravel, I saw a couple of tutorials to use jwt auth in this. It was working good but now is show an error not always but I don't know why. this is it:

Argument 3 passed to Lcobucci\JWT\Signer\Hmac::doVerify() must be an instance of Lcobucci\JWT\Signer\Key, null given, called in C:\xampp\htdocs\inmobiliaria\vendor\lcobucci\jwt\src\Signer\BaseSigner.php on line 42

Sometimes it works but not another. so I don't know what can I do. I tried with

1. php artisan cache:clear
2. php artisan config:clear
3. php artisan jwt:secret

but the problem still there, sometimes i get good answer from server(200) but the most part of then al bad (500).

Screenshots

Answer 1

Here's complete snippet

php artisan key:generate
php artisan jwt:secret
php artisan cache:clear
php artisan config:clear

Before run above commands make sure there is install jwt package, than check its config file name jwt.php in config folder.

Answer 2

In fact it's the right thing to solve it:

php artisan key:generate
php artisan jwt:secret