okhttp3.call没有Fileinfo

Question

当我尝试使用Retrofit2时，它向我显示错误。错误为 okhttp3.call没有Fileinfo

这是 MainActivity.java 文件中的我的错误部分

public void onClick(View v) {
               File file = new File(imagePath);
                RequestBody requestBody = RequestBody.create(MediaType.parse("multipart/form-data"),file);
                MultipartBody.Part body = MultipartBody.Part.createFormData("file",file.getName() , requestBody);

                Call<FileInfo> call = fileService.upload(body);
                ((retrofit2.Call) call).enqueue(new Callback<FileInfo>() {
                    @Override
                    public void onResponse(Callback<FileInfo> call, Response<FileInfo> response) {
                        if(response.isSuccessful()){
                            Toast.makeText(MainActivity.this,"Image upload success", Toast.LENGTH_SHORT).show();

                        }

                    }

                    @Override
                    public void onFailure(Callback<FileInfo> call, Throwable t) {
                        Toast.makeText(MainActivity.this, "ERROR: " + t.getMessage(),Toast.LENGTH_SHORT).show();

                    }
                });

            }

此处的错误代码块的屏幕截图