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Error: Invalid or corrupt jarfile


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I have been trying to download FML Forge but when I try to use the installer it comes up with a pop-up that says Error: invalid or corrupt jarfile.


I have the latest version of Java as far as I can tell (Version 8 Update 211 build 1.8.0_211-b12).


I have tried with both MC 1.12.2 and 1.8- but both get the same message.


I have been Googling the issue and there was one similar thread on here back from 2013 which suggested the approach used in this video (https://www.youtube.com/watch?v=j6uMF-PjGT4) but I got the same message.


The log says this:


Microsoft Windows [Version 10.0.17134.706]
(c) 2018 Microsoft Corporation. All rights reserved.

C:\Users\rando>cd Downloads

 Volume in drive C has no label.
 Volume Serial Number is 6E01-1276

 Directory of C:\Users\rando\Downloads

24/04/2019  12:57    <DIR>          .
24/04/2019  12:57    <DIR>          ..
27/09/2018  14:04       545,624,544 411.70-desktop-win10-64bit-international-whql.exe
24/04/2019  12:54         1,447,178 7z1900-x64.exe
27/09/2018  12:36         4,112,408 DriverEasy_Setup.exe
08/11/2018  17:21        33,542,144 EpicInstaller-7.16.0-fortnite-84bd10ff81294e439cbb4ae14d83477b.msi
24/04/2019  12:57                 0 fml-1.8-
24/04/2019  12:41                 0 forge-1.12.2-
11/10/2018  23:58        90,555,568 GeForce_Experience_v3.15.0.164.exe
12/10/2018  00:20    <DIR>          Intel Driver and Support Assistant
27/09/2018  13:06        14,925,896 Intel Driver and Support Assistant Installer.exe
24/04/2019  12:48         2,043,232 JavaSetup8u211.exe
27/09/2018  17:00       274,317,312 LibreOffice_6.0.6_Win_x64.msi
27/09/2018  16:24         5,136,384 LibreOffice_6.0.6_Win_x64_helppack_en-GB.msi
25/10/2018  17:46        39,333,888 MinecraftInstaller.msi
30/03/2019  21:30         7,885,155 openttd-1.8.0-windows-win64.exe
27/09/2018  13:53           605,424 ReimageRepair.exe
20/12/2018  23:40        62,928,040 Skype-
04/10/2018  16:29           585,912 smfree_dm.exe
16/03/2019  19:35           911,688 SpotifySetup.exe
24/04/2019  12:55    <DIR>          SS6.3
19/04/2019  19:46     2,364,423,415 SS6.3.rar
24/04/2019  12:56    <DIR>          SS6.4_patch
19/04/2019  19:09       137,441,104 SS6.4_patch.rar
27/09/2018  16:26         1,573,568 SteamSetup.exe
22/02/2017  18:41        35,327,920 SystemMechanicFreeInstaller.exe
              21 File(s)  3,622,720,780 bytes
               5 Dir(s)  257,541,177,344 bytes free

C:\Users\rando\Downloads>java -jar fml-1.8-
Error: Invalid or corrupt jarfile fml-1.8-

C:\Users\rando\Downloads>java -jar forge-1.12.2-
Error: Invalid or corrupt jarfile forge-1.12.2-



It looks something like this:




I don't know very much about programming and apologies if I've made a mistake - I did read the rules so have tried to make a correct post.


Thank you.


Edited by iakosv
Took out an image
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Firefox and a 0 kB Forge installer, Firefox blocked the download.

Go to Firefox’s download manager to recover the file and try again.

This is my Forum Signature, I am currently attempting to transform it into a small guide for fixing easier issues using spoiler blocks to keep things tidy.


As the most common issue I feel I should put this outside the main bulk:

The only official source for Forge is https://files.minecraftforge.net, and the only site I trust for getting mods is CurseForge.

If you use any site other than these, please take a look at the StopModReposts project and install their browser extension, I would also advise running a virus scan.


For players asking for assistance with Forge please expand the spoiler below and read the appropriate section(s) in its/their entirety.


Logs (Most issues require logs to diagnose):


Please post logs using one of the following sites (Thank you Lumber Wizard for the list):

https://gist.github.com/100MB Requires member (Free)

https://pastebin.com/: 512KB as guest, 10MB as Pro ($$$)

https://hastebin.com/: 400KB

Do NOT use sites like Mediafire, Dropbox, OneDrive, Google Drive, or a site that has a countdown before offering downloads.


What to provide:

...for Crashes and Runtime issues:

Minecraft 1.14.4 and newer:

Post debug.log

Older versions:

Please update...


...for Installer Issues:

Post your installer log, found in the same place you ran the installer

This log will be called either installer.log or named the same as the installer but with .log on the end

Note for Windows users:

Windows hides file extensions by default so the installer may appear without the .jar extension then when the .log is added the log will appear with the .jar extension


Where to get it:

Mojang Launcher: When using the Mojang launcher debug.log is found in .minecraft\logs.


Curse/Overwolf: If you are using the Curse Launcher, their configurations break Forge's log settings, fortunately there is an easier workaround than I originally thought, this works even with Curse's installation of the Minecraft launcher as long as it is not launched THROUGH Twitch:

  1. Make sure you have the correct version of Forge installed (some packs are heavily dependent on one specific build of Forge)
  2. Make a launcher profile targeting this version of Forge.
  3. Set the launcher profile's GameDir property to the pack's instance folder (not the instances folder, the folder that has the pack's name on it).
  4. Now launch the pack through that profile and follow the "Mojang Launcher" instructions above.






or alternately, 


Fallback ("No logs are generated"):

If you don't see logs generated in the usual place, provide the launcher_log.txt from .minecraft


Server Not Starting:


If your server does not start or a command window appears and immediately goes away, run the jar manually and provide the output.


Reporting Illegal/Inappropriate Adfocus Ads:


Get a screenshot of the URL bar or copy/paste the whole URL into a thread on the General Discussion board with a description of the Ad.

Lex will need the Ad ID contained in that URL to report it to Adfocus' support team.


Posting your mod as a GitHub Repo:


When you have an issue with your mod the most helpful thing you can do when asking for help is to provide your code to those helping you. The most convenient way to do this is via GitHub or another source control hub.

When setting up a GitHub Repo it might seem easy to just upload everything, however this method has the potential for mistakes that could lead to trouble later on, it is recommended to use a Git client or to get comfortable with the Git command line. The following instructions will use the Git Command Line and as such they assume you already have it installed and that you have created a repository.


  1. Open a command prompt (CMD, Powershell, Terminal, etc).
  2. Navigate to the folder you extracted Forge’s MDK to (the one that had all the licenses in).
  3. Run the following commands:
    1. git init
    2. git remote add origin [Your Repository's URL]
      • In the case of GitHub it should look like: https://GitHub.com/[Your Username]/[Repo Name].git
    3. git fetch
    4. git checkout --track origin/master
    5. git stage *
    6. git commit -m "[Your commit message]"
    7. git push
  4. Navigate to GitHub and you should now see most of the files.
    • note that it is intentional that some are not synced with GitHub and this is done with the (hidden) .gitignore file that Forge’s MDK has provided (hence the strictness on which folder git init is run from)
  5. Now you can share your GitHub link with those who you are asking for help.

[Workaround line, please ignore]


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  • 2 years later...

I'm going through the same problem every time I try to download a mod, I open it and it tells me the following Error: Invaild or Corrupt jarfile I don't know how to solve it I couldn't install mods I would like to solve it thanks for your understanding🤝

Edited by Juan22
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