Karlo api사용시 에러

안녕하세요. 스프링 부트 기반으로 karlo를 사용해보려고하는데
다음과같은 에러가 뜹니다.
{“code”:-401,“msg”:“kapi: invalid token”}"

해결방법을 알수 있을까요? 감사합니다.

package com.emiary.service;

import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.Base64;
import java.util.Collections;

import javax.imageio.ImageIO;

import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;

import com.fasterxml.jackson.databind.ObjectMapper;

import lombok.extern.slf4j.Slf4j;
@Slf4j
@Service
public class ImageGenerationService {

private final String REST_API_KEY = "${api키는 이곳에 넣음}";
private final String T2I_URL = "https://api.kakaobrain.com/v1/inference/karlo/t2i";

public BufferedImage generateImage(String text) throws IOException {
	log.debug("이미지 서비스 들어옴 {}",text);
    RestTemplate restTemplate = new RestTemplate();
    restTemplate.setRequestFactory(new HttpComponentsClientHttpRequestFactory());
    HttpHeaders headers = new HttpHeaders();
    headers.set("Authorization", "KakaoAK " + REST_API_KEY);
    headers.setContentType(MediaType.APPLICATION_JSON);
    ObjectMapper objectMapper = new ObjectMapper();
    String requestBody = objectMapper.writeValueAsString(Collections.singletonMap("prompt",
            Collections.singletonMap("text", text)));
    HttpEntity<String> requestEntity = new HttpEntity<>(requestBody, headers);

    ResponseEntity<String> responseEntity = restTemplate.exchange(T2I_URL, HttpMethod.POST, requestEntity, String.class);
    String responseJson = responseEntity.getBody();
    ObjectMapper mapper = new ObjectMapper();
    ImageResponse response = mapper.readValue(responseJson, ImageResponse.class);
    String base64ImageString = response.getImages().get(0).getImage();
    byte[] decodedBytes = Base64.getDecoder().decode(base64ImageString);
    ByteArrayInputStream bis = new ByteArrayInputStream(decodedBytes);
    return ImageIO.read(bis);
}

private static class ImageResponse {
    private java.util.List<ImageData> images;

    public java.util.List<ImageData> getImages() {
        return images;
    }

    public void setImages(java.util.List<ImageData> images) {
        this.images = images;
    }
}

private static class ImageData {
    private String image;

    public String getImage() {
        return image;
    }

    public void setImage(String image) {
        this.image = image;
    }
}

}

안녕하세요, 답변이 늦어 죄송합니다.

혹시 이 질문과 연관이 있을까요?
https://devtalk.kakao.com/t/re-karlo-api/127493

확인 후 이상이 있다면 댓글 남겨주세요

감사합니다.