Problem with Mloader: it no longer downloads

[Vorffeed]

Hi, I don't know if they've changed something on the website, but the program won't download anymore ><

https://mangaplus.shueisha.co.jp/viewer/2010777

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| ' _ \| |/ _ \ / _ |/ _` |/ _ \ '|
| | | | | | | () | (| | (| | __/ |
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15.05.2026 20:25:44 | INFO | main.py 206 | Started export
15.05.2026 20:25:45 | INFO | loader.py 140 | 1/1) Manga:
15.05.2026 20:25:45 | INFO | loader.py 141 | Author:
15.05.2026 20:25:46 | ERROR | main.py 226 | Failed to download manga
Traceback (most recent call last):
File "C:\Users\Lina\AppData\Local\Programs\Python\Python313\Lib\site-packages\mloader_main_.py", line 218, in main
loader.download(
~~~~~~~~~~~~~~~^
title_ids=titles,
^^^^^^^^^^^^^^^^^
...<3 lines>...
last_chapter=last,
^^^^^^^^^^^^^^^^^^
)
^
File "C:\Users\Lina\AppData\Local\Programs\Python\Python313\Lib\site-packages\mloader\loader.py", line 191, in download
self._download(manga_list)
~~~~~~~~~~~~~~^^^^^^^^^^^^
File "C:\Users\Lina\AppData\Local\Programs\Python\Python313\Lib\site-packages\mloader\loader.py", line 146, in _download
chapter = viewer.pages[-1].last_page.current_chapter
~~~~~~~~~~~~^^^^
File "C:\Users\Lina\AppData\Local\Programs\Python\Python313\Lib\site-packages\google\protobuf\internal\containers.py", line 93, in getitem
return self._values[key]
~~~~~~~~~~~~^^^^^
IndexError: list index out of range
15.05.2026 20:25:46 | INFO | main.py 227 | SUCCESS

• OS: [Windows 11 x64]
• Python version: [3.13.12]
• mloader version: [ 1.1.12]

[satriobayuary]

This happened to me too last night

[Aki013]

Hi,

Same error message on my side

Just looked at it and and api response seems saying "You have been banned from MANGA Plus by SHUEISHA due to a possible violation of our Terms of Service."

But maybe api url change from "https://jumpg-webapi.tokyo-cdn.com" to "https://jumpg-api.tokyo-cdn.com". After trying to change this url, it says in response to call that "There are issues connecting to Manga+. Please try again later.(10511)"

Just tried to look at it if it can help

Thanks

[Kaiserdragon2]

Navigate to loader.py file and in the MangaLoader class edit the self.session.headers.update to include a session token.
That lets it work again.

        self.session.headers.update(
            {
                "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; "
                "rv:72.0) Gecko/20100101 Firefox/72.0",
                "Session-Token":"ghjkfsdhgjkdsfhj",

            }
        )

[Vorffeed]

Thank you
If you just need to add an authentication token, you can also add this line

        with open("token.txt", "r", encoding="utf-8") as f:
            current_token= f.read().strip()
        self.session.headers.update(
            {
                “User-Agent”: “Mozilla/5.0 (Windows NT 10.0; Win64; x64; ”
                “rv:72.0) Gecko/20100101 Firefox/72.0”,
                “Session-Token”: current_token,
            }
        )

Create a text file named token.txt where you usually call the mloader script, and place the token code inside it, that way, if the script fails, you can simply add the new token there instead of having to search for the line of code every time you need to renew it.

[Jaculabilis]

Where are you getting authentication tokens from? The SESSION_ID_KEY UUID in local storage when visiting the website?

I found that the chapter download worked with just a blank Session-Token header, but even with the UUID as the value I still get the ban error when I try the listing endpoints to get the current chapters.

[Tristan-Hess]

Greetings everyone,
I still get the technical issues despite solutions shared above. Maybe I failed to grasp the solution due to my lack of comprehension?

|  ERROR   |  __main__.py   226  | Failed to download manga
Traceback (most recent call last):
  File "D:\_Progs\python\Lib\site-packages\mloader\__main__.py", line 218, in main
    loader.download(
  File "D:\_Progs\python\Lib\site-packages\mloader\loader.py", line 191, in download
    self._download(manga_list)
  File "D:\_Progs\python\Lib\site-packages\mloader\loader.py", line 146, in _download
    chapter = viewer.pages[-1].last_page.current_chapter
              ~~~~~~~~~~~~^^^^
  File "D:\_Progs\python\Lib\site-packages\google\protobuf\internal\containers.py", line 93, in __getitem__
    return self._values[key]
           ~~~~~~~~~~~~^^^^^
IndexError: list index out of range

I tried to get the token from F12>Applications>Local storage>SESSION_ID_KEY>Value (=Token)

[Kaiserdragon2]

The mobile api changed the layout of the protobuffer protocol i think it got changed on the the web api to from the look off it. Currently i am unable to verify this.

[Vorffeed]

Greetings everyone, I still get the technical issues despite solutions shared above. Maybe I failed to grasp the solution due to my lack of comprehension?

|  ERROR   |  __main__.py   226  | Failed to download manga
Traceback (most recent call last):
  File "D:\_Progs\python\Lib\site-packages\mloader\__main__.py", line 218, in main
    loader.download(
  File "D:\_Progs\python\Lib\site-packages\mloader\loader.py", line 191, in download
    self._download(manga_list)
  File "D:\_Progs\python\Lib\site-packages\mloader\loader.py", line 146, in _download
    chapter = viewer.pages[-1].last_page.current_chapter
              ~~~~~~~~~~~~^^^^
  File "D:\_Progs\python\Lib\site-packages\google\protobuf\internal\containers.py", line 93, in __getitem__
    return self._values[key]
           ~~~~~~~~~~~~^^^^^
IndexError: list index out of range

I tried to get the token from F12>Applications>Local storage>SESSION_ID_KEY>Value (=Token)

How to Get Your Own Session Token
Open your browser (Chrome, Edge, or Firefox) and go to the website where the program gets its manga (for example, https://mangaplus.shueisha.co.jp/).

Log in to your account on the website if you haven’t already.

Press the F12 key (or right-click anywhere on the page and select Inspect). This will open the developer tools.

Go to the Network tab.

In the filter, select “manga_viewer_v3,” and in the lower-left window, you'll see the session token—that's where you can get it.

[Tristan-Hess]

go to the website where the program gets its manga (for example, shonenjumpplus.com).

Log in to your account on the website if you haven’t already.

Maybe it is a UE thing, but I do not have the option to log an account into MangaPlus.

[Vorffeed]

Sorry, it was that darn translator—I have no idea how it changed the URL lol

[infernalsaber]

it's not that complex tbh, you can just input any uuid1 and it'll do, eg.

import uuid
token = str(uuid.uuid1())
self.session.headers.update(
            {
                "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/148.0.0.0 Safari/537.36",
                "Session-Token":token
            }
        )

[Tristan-Hess]

it's not that complex tbh, you can just input any uuid1 and it'll do, eg.

import uuid
token = str(uuid.uuid1())
self.session.headers.update(
            {
                "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/148.0.0.0 Safari/537.36",
                "Session-Token":token
            }
        )

Thanks, now it works on my side. Please note I had two versions, each on different disks, which conflicted each others.