Poopooracoocoo

Those other mods are declaring themselves as **incompatible** with OptiFine and OptiFabric for a reason. Even if you forcibly ignored that by creating a Fabric dependency override, you'd encounter issues....

The latest version of OptiFabric for 1.16.5 is 1.13.16. It supports Fabric Loader 0.14.25. You're likely using a much older version of OptiFabric. Keep in mind that CurseForge has a...

@Dracconis My comments here have been more for the support requests to try to keep this as more of an issue tracker than a support forum. I don't have the...

"Error code 1" just means the game crashed. Look for a crash report in your crash-reports folder or a latest.log in your logs folder.

You could alternatively have updated OptiFabric. Why would you use such an old version in the first place?

I meant an old version of OptiFabric. The latest version of OptiFabric for Minecraft 1.16.5 is 1.13.16. But now that you mention your Minecraft version, you could use the ViaFabricPlus...

Use Fabric API 0.76.

There's a workaround in #1112

It's worth noting that the Fabric Loader 0.15.0+ and FAPI 0.85.0+ incompatibilities were fixed with OptiFabric 0.14.3. So you may want to just update it.

@eyskak Since Stacc API only fixed this in a version for 1.20.1, you'll have to just use Fabric Loader 0.14.25. You might like to ask the Stacc developer to backport...