我想通过使用retrofit multipart将图像和字符串数据都保存在服务器上，但我得到了一个错误

implementation 'com.squareup.retrofit2:retrofit:2.x.x'
implementation 'com.squareup.retrofit2:converter-gson:2.x.x'
implementation 'com.squareup.retrofit2:converter-scalars:2.x.x'
implementation 'com.squareup.okhttp3:okhttp:4.x.x'
implementation 'com.squareup.okhttp3:logging-interceptor:4.x.x'

Retrofit retrofit = new Retrofit.Builder()
    .baseUrl("https://api.example.com/")
    .addConverterFactory(GsonConverterFactory.create())
    .client(new OkHttpClient.Builder().build())
    .build();

public interface ApiService {
    @Multipart
    @POST("upload")
    Call<ResponseBody> uploadImage(@Part("image") RequestBody image, @Part("data") RequestBody data);
}

// 创建图像请求体
File imageFile = new File("path/to/image.jpg");
RequestBody imageRequestBody = RequestBody.create(MediaType.parse("image/*"), imageFile);

// 创建字符串数据请求体
RequestBody dataRequestBody = RequestBody.create(MediaType.parse("text/plain"), "Some data");

ApiService apiService = retrofit.create(ApiService.class);
Call<ResponseBody> call = apiService.uploadImage(imageRequestBody, dataRequestBody);
call.enqueue(new Callback<ResponseBody>() {
    @Override
    public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
        // 处理成功响应
    }

    @Override
    public void onFailure(Call<ResponseBody> call, Throwable t) {
        // 处理失败响应
    }
});