Problems encountered when submitting answers to the server

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Problems encountered when submitting answers to the server
The location of the problem is ( func submit_quiz_answers() : )

This is my code:
extends Control

var base_url = “https://lms.jinhyung.kim/api/quiz/”
var chapter_id = 3
var submit_url = base_url + str(chapter_id) + “/submit”

@onready var http_request = $HTTPRequest
@onready var questions_container = $QuestionsContainer
@onready var submit_button = $SubmitButton

var quiz_questions =

func _ready():
if submit_button.is_connected(“pressed”, Callable(self, “_on_submit_button_pressed”)):
submit_button.disconnect(“pressed”, Callable(self, “_on_submit_button_pressed”))

submit_button.connect("pressed", Callable(self, "_on_submit_button_pressed"))

var token = Globals.jwt_token
print("JWT Token: ", token)
get_quiz_questions(token)

$LogOutImage.visible = false

func get_quiz_questions(token):
var url = base_url + str(chapter_id)
var headers = ["Authorization: Bearer " + token]
print("Requesting URL: ", url)
print("Request Headers: ", headers)

http_request.request(url, headers, HTTPClient.METHOD_GET)
http_request.connect("request_completed", Callable(self, "_on_get_quiz_request_completed"))

func _on_get_quiz_request_completed(result, response_code, headers, body):
print("Response Code: ", response_code)
if response_code == 200:
var json_result = JSON.new()
var parse_error = json_result.parse(body.get_string_from_utf8())

	if parse_error == OK:
		quiz_questions = json_result.data
		print("Quiz questions: ", quiz_questions)
		display_all_questions()
	else:
		print("JSON parse error")
else:
	print("Error fetching quiz questions: ", response_code)
	print("Response body: ", body.get_string_from_utf8())

func display_all_questions():
clear_container(questions_container)

questions_container.columns = 2

if quiz_questions.size() > 0:
	for i in range(quiz_questions.size()):
		var question = quiz_questions[i]

		var vbox = VBoxContainer.new()
		vbox.name = "QuestionContainer_" + str(i + 1)
		questions_container.add_child(vbox)

		var question_label = Label.new()
		question_label.text = str(i + 1) + ". " + question.content
		vbox.add_child(question_label)

		for j in range(question.options.size()):
			var option = question.options[j].content
			var option_letter = String(char(97 + j))

			var option_checkbox = CheckBox.new()
			option_checkbox.text = "   " + option_letter + ") " + option
			option_checkbox.set_meta("question_id", question.id)
			option_checkbox.set_meta("option_id", question.options[j].id)
			vbox.add_child(option_checkbox)

func clear_container(container):
for child in container.get_children():
container.remove_child(child)
child.queue_free()

func _on_submit_button_pressed():
submit_quiz_answers()

func submit_quiz_answers():
var answers = {
“answers”:
}

for i in range(quiz_questions.size()):
	var question_id = quiz_questions[i].id
	var selected_option_id = get_selected_option_id(i)
	if selected_option_id != null:
		answers["answers"].append({ "quizId": question_id, "optionId": selected_option_id })

var json_data = JSON.stringify(answers)
var token = Globals.jwt_token
var headers = [
	"Authorization: Bearer " + token,
	"Content-Type: application/json"
]

print("Submitting answers to: ", submit_url)
print("Headers: ", headers)
print("Request Body: ", json_data)

http_request.request(submit_url, headers, HTTPClient.METHOD_POST, json_data)
http_request.connect("request_completed", Callable(self, "_on_submit_quiz_request_completed"))

func get_selected_option_id(question_index):
var vbox = questions_container.get_child(question_index)
for child in vbox.get_children():
if child is CheckBox and child.is_pressed():
return child.get_meta(“option_id”)
return null

func _on_submit_quiz_request_completed(result, response_code, headers, body):
print("Response Code (Submit): ", response_code)
if response_code == 200:
var json_result = JSON.new()
var parse_error = json_result.parse(body.get_string_from_utf8())

	if parse_error == OK:
		var submission_result = json_result.data
		print("Submission result: ", submission_result)

		var result_text = "\n\nQuiz submission results:\n"
		result_text += "Correct Answers: " + str(submission_result.correctAnswers) + "\n"
		result_text += "Total Score: " + str(submission_result.totalScore)

		var result_label = Label.new()
		result_label.text = result_text
		questions_container.add_child(result_label)
	else:
		print("JSON parse error")
else:
	print("Error submitting answers: ", response_code)
	print("Response body: ", body.get_string_from_utf8())

func _on_board_button_pressed() → void:
get_tree().change_scene_to_file(“res://Scene/main_board.tscn”)

This is issue：
Submitting answers to: https://lms.jinhyung.kim/api/quiz/3/submit
Headers: [“Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOjk3LCJyb2xlIjoidXNlciIsImlhdCI6MTcyNzI1MzgyN30.gHzlSg9EDntiq1gN5OmaemtqpICk2X8cNxNUHJJuYdo”, “Content-Type: application/json”]
Request Body: {“answers”:[{“optionId”:6,“quizId”:2},{“optionId”:1,“quizId”:1},{“optionId”:30,“quizId”:8},{“optionId”:27,“quizId”:7}]}
Response Code: 500
Error fetching quiz questions: 500
Response body: {“statusCode”:500,“message”:“Internal server error”}
Response Code (Submit): 500
Error submitting answers: 500
Response body: {“statusCode”:500,“message”:“Internal server error”}