FoamFix and SpongeForge – Installing SpongeForge in a pre-existing modpack

Have you just installed SpongeForge in your server and now it is not starting?
This probably means that your server is running a modpack that contains a mod called ” [FoamFix](https://www.curseforge.com/minecraft/mc-mods/foamfix-for-minecraft) “, which is preventing the server from starting properly.

This article will try to help you on how you can install SpongeForge in your modded server without issues.

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# Information

**Why SpongeForge ?**
You can check more information regarding SpongeForge in our [Understanding Plugins and Mods](https://help.ggservers.com/en-us/article/understanding-servers-using-mods-and-plugins-at-the-same-time-1ko7ils/) article.

**What are all Minecraft Versions that SpongeForge can run ?**
SpongeForge can work properly in any 1.10.2, 1.11, 1.11.2, 1.12, 1.12.1 or 1.12.2 modded servers. You can also check more about it in our [SpongeForge](https://help.ggservers.com/en-us/article/understanding-servers-using-mods-and-plugins-at-the-same-time-1ko7ils) article.

**What is FoamFix ?**
In few words, FoamFix is a mod that was done with the objective to optimize modded Minecraft using as simple, targeted optimizations.

**Where can I find FoamFix ?**
You can find FoamFix mod [here](https://www.curseforge.com/minecraft/mc-mods/foamfix-for-minecraft).
Feed The Beast modapacks also usually have this mod pre-installed.

**How can I have sure if my server is running with FoamFix ?**
You can check if your server have or not FoamFix by opening your [FTP](https://help.ggservers.com/en-us/article/how-to-access-your-minecraft-server-files-via-ftp-18ealdp/) and going to _/mods_ directory.
If FoarmFix is there, then your server is trying to execute SpongeForge but FoamFix is preventing it from start.

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# How to Fix

To get all this shorted, we need to firstly open your server files, which you can find them in your [FTP File Access](https://help.ggservers.com/en-us/article/how-to-access-your-minecraft-server-files-via-ftp-18ealdp/).

|| ❓ If you don’t know what is FTP or how to use it, we suggest you to read our [How to: Access Your Minecraft Server Files Via FTP](/en-us/article/how-to-access-your-minecraft-server-files-via-ftp-18ealdp/) artile.

So now you need to:

1. Stop your server.
2. Login in your [FTP File Access](https://help.ggservers.com/en-us/article/how-to-access-your-minecraft-server-files-via-ftp-18ealdp/).
3. Open the ” _config_ ” directory. (/config folder).


4. Scroll down and find the ” _foamfix.cfg_ ” file.
5. Right-Click and then click on ” _ Edit_ “.


6. Now you’ll need to find two settings and change both values from ” _true_ ” to ” _false_ ”
There you’ll need to find:
`B:optimizedBlockPos` and `B:patchChunkSerialization`.
7. Once you find, set both values to ” _false_ “.


8. Click on Save.
9. Back to your Control Panel and start your server.

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Done!
Now your server must execute SpongeForge in your modded server!

| Feel free to open a ticket in your Client Area if you need any further assistance.

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## Useful Links:
* [Understanding: Servers using mods and plugins at the same time](/en-us/article/understanding-servers-using-mods-and-plugins-at-the-same-time-1ko7ils/)
* [How to: Access Your Minecraft Server Files Via FTP](/en-us/article/how-to-access-your-minecraft-server-files-via-ftp-18ealdp/)
* [Custom Forge Installation](/en-us/article/custom-forge-installation-1u6gex2/)
* [Feed The Beast Installation](/en-us/article/feed-the-beast-installation-6yeh4s/)
* [How to install Mods on your server](https://help.ggservers.com/en-us/article/how-to-install-mods-on-your-server-1bauy2t/)