when i want to connect have this problem "error": "Internal Server Error", "message": "No message available", : <p><a href="https://i.stack.imgur.com/waLH8.png" rel="nofollow noreferrer"> i have this code i can create a user i can get the username and password but i have an error when i want to connect  </a></p>

<p>@PostMapping("/signin")</p>

<pre><code>public ResponseEntity&lt;?&gt; authenticateUser(@Valid @RequestBody LoginRequest loginRequest) {

    System.out.println("a"+loginRequest.getUsername()+loginRequest.getPassword());
    Authentication authentication = authenticationManager.authenticate(
            new UsernamePasswordAuthenticationToken(loginRequest.getUsername(), loginRequest.getPassword()));
    System.out.println("a"+loginRequest.getUsername()+loginRequest.getPassword());
   // new RuntimeException("Error: cccccc is not found.");
    SecurityContextHolder.getContext().setAuthentication(authentication);
    String jwt = jwtUtils.generateJwtToken(authentication);
   new RuntimeException("Error: cccccc is not found."+ jwt);
    //    new RuntimeException("Error: cccccc is not found.");
    UserDetailslmpl userDetails = (UserDetailslmpl) authentication.getPrincipal();
    List&lt;String&gt; roles = userDetails.getAuthorities().stream()
            .map(item -&gt; item.getAuthority())
            .collect(Collectors.toList());
   // new RuntimeException("Error: aaaa is not found.");
    return ResponseEntity.ok(new JwtResponse(jwt,
            userDetails.getId(),
            userDetails.getUsername(),
            userDetails.getEmail(),
            roles));
}
</code></pre>

<p><a href="https://i.stack.imgur.com/LftFB.png" rel="nofollow noreferrer">this is the error</a></p>

<p><a href="https://i.stack.imgur.com/DZSHG.png" rel="nofollow noreferrer">the error on postman</a></p>
