Just updated to 1.17 using Fabric. Everything works but only if I remove fabric-carpet-1.17-1.4.40+v210608.jar or optifabric-1.11.1.jar from my mods folder. Otherwise I get the generic game crash message in the launcher. There seems to be an incompatibility between those mods. For reference I'm also using preview_OptiFine_1.17_HD_U_G9_pre21.jar. Would like to use these in tandem again. Thanks.

Do you have a crash report or Minecraft logs from reproducing this issue? If so, can you please post them here?

I'm pretty confident we have the same problem because im using the same files as him above. hope this helps

[00:01:44] [main/INFO]: Loading for game Minecraft 1.17
[00:01:45] [ForkJoinPool-1-worker-13/WARN]: Non-Fabric mod JAR at "C:\Users\123ta\AppData\Roaming.minecraft\versions\fabric-loader-0.11.5-1.17\mods\preview_OptiFine_1.17_HD_U_G9_pre21.jar", ignoring
[00:01:45] [main/INFO]: [FabricLoader] Loading 51 mods:
- [email protected]
- [email protected]+1.17
- [email protected]+a02b44633d
- [email protected]+1d383bb63d
- [email protected]+c345aea83d
- [email protected]+a02b44633d
- [email protected]+a02b44633d
- [email protected]+92519afa3d
- [email protected]+a02b44633d
- [email protected]+a02b44633d
- [email protected]+be9da3103d
- [email protected]+a02b44633d
- [email protected]+a02b44633d
- [email protected]+a02b44633d
- [email protected]+92519afa3d
- [email protected]+a02b44633d
- [email protected]+a02b44633d
- [email protected]+b7ab61213d
- [email protected]+a02b44633d
- [email protected]+36b77c3e3d
- [email protected]+a02b44633d
- [email protected]+a02b44633d
- [email protected]+92519afa3d
- [email protected]+a02b44633d
- [email protected]+b7ab61213d
- [email protected]+a02b44633d
- [email protected]+92519afa3d
- [email protected]+b7ab61213d
- [email protected]+a02b44633d
- [email protected]+a02b44633d
- [email protected]+e2961fee3d
- [email protected]+676f40fa3d
- [email protected]+a02b44633d
- [email protected]+a02b44633d
- [email protected]+a02b44633d
- [email protected]+a02b44633d
- [email protected]+92519afa3d
- [email protected]+a02b44633d
- [email protected]+b7ab61213d
- [email protected]+198a96213d
- [email protected]+a02b44633d
- [email protected]+be9da3103d
- [email protected]+a02b44633d
- [email protected]+a02b44633d
- [email protected]+b7ab61213d
- [email protected]
- java@16
- [email protected]
- [email protected]
- [email protected]
- [email protected]
[00:01:45] [main/INFO]: SpongePowered MIXIN Subsystem Version=0.8.2 Source=file:/C:/Users/123ta/AppData/Roaming/.minecraft/libraries/net/fabricmc/sponge-mixin/0.9.4+mixin.0.8.2/sponge-mixin-0.9.4+mixin.0.8.2.jar Service=Knot/Fabric Env=CLIENT
[00:01:45] [main/INFO]: Compatibility level set to JAVA_16
[00:01:45] [main/WARN]: @mixin target net/minecraft/class_2474$class_5124 is public in fabric-tag-extensions-v0.mixins.json:MixinObjectBuilder and should be specified in value

related to Chocohead/OptiFabric#245

this time the case manifested itself on the optifabric side. Not the problem with optifabric - probably optifine changed again something. Lets say what optifabric devs say here.

@AustinVW2002 yes this looks like the same issue. Just a little more info:

[main/INFO]: Loading for game Minecraft 1.17
[ForkJoinPool-1-worker-3/WARN]: Non-Fabric mod JAR at "C:\Users\<hidden>\AppData\Roaming\.minecraft\mods\preview_OptiFine_1.17_HD_U_G9_pre21.jar", ignoring
[main/WARN]: Warnings were found!  Conflicting versions found for fabric-resource-loader-v0: used 0.4.7+b7ab6121d5, also found 0.4.7+b7ab61213d
[main/INFO]: [FabricLoader] Loading 55 mods: [email protected]+676f40fa3d, [email protected]+36b77c3e3d, [email protected], [email protected]+be9da3103d, [email protected]+a02b44633d, [email protected]+a02b44633d, [email protected]+b7ab61213d, java@16, [email protected]+a02b44633d, [email protected]+a02b44633d, [email protected]+a02b44633d, [email protected], [email protected]+a02b44633d, [email protected], [email protected]+a02b44633d, [email protected], [email protected]+a02b44633d, [email protected]+a02b44633d, [email protected]+a02b44633d, [email protected], [email protected], [email protected]+a02b44633d, [email protected]+1.17, [email protected], [email protected]+a02b44633d, [email protected]+92519afa3d, [email protected]+1d383bb63d, [email protected]+a02b44633d, [email protected]+a02b44633d, [email protected], [email protected]+a02b44633d, [email protected]+198a96213d, [email protected]+b7ab61213d, [email protected]+a02b44633d, [email protected]+be9da3103d, [email protected]+a02b44633d, [email protected]+a02b44633d, [email protected]+a02b44633d, [email protected]+92519afa3d, [email protected]+a02b44633d, [email protected]+a02b44633d, [email protected]+b7ab6121d5, [email protected]+dev.22, [email protected]+a02b44633d, [email protected]+a02b44633d, [email protected]+c345aea83d, [email protected], [email protected]+92519afa3d, [email protected]+e2961fee3d, [email protected]+92519afa3d, [email protected]+b7ab61213d, [email protected]+92519afa3d, [email protected]+b7ab61213d, [email protected]+a02b44633d, [email protected]+a02b44633d
[main/INFO]: SpongePowered MIXIN Subsystem Version=0.8.2 Source=file:/C:/Users/<hidden>/AppData/Roaming/.minecraft/libraries/net/fabricmc/sponge-mixin/0.9.2+mixin.0.8.2/sponge-mixin-0.9.2+mixin.0.8.2.jar Service=Knot/Fabric Env=CLIENT
[main/WARN]: The requested compatibility level JAVA_16 is higher than the level supported by the active subsystem 'Knot/Fabric' which supports JAVA_14. This is not a supported configuration and instability may occur.
[main/INFO]: Compatibility level set to JAVA_16
[main/WARN]: @Mixin target net/minecraft/class_2474$class_5124 is public in fabric-tag-extensions-v0.mixins.json:MixinObjectBuilder and should be specified in value

I upgraded my local Java to 16 and still nothing. But that's really just a warning. Seems the real issue is a conflicting dependency on fabric-resource-loader-v0.

@gnembon I agree this is probably on optifine/optifabric's side. I just noticed it when using carpet and optifabric together. They work fine when they are not paired.

Use the alpha version of optifabric, seems like chocohead fixed it with their latest commit