java.lang.NoClassDefFoundError: net/fabricmc/tinyremapper/IMappingProvider
at me.modmuss50.optifabric.mod.OptifabricSetup.run(OptifabricSetup.java:46)
at java.util.ArrayList.forEach(Unknown Source)
Please help

Just uninstall OptiFabric and optifine mods, i think it conflict with another mods. I recommend you to use Sodium and Iris shaders instead of optifine

java.lang.NoClassDefFoundError: net/fabricmc/tinyremapper/IMappingProvider at me.modmuss50.optifabric.mod.OptifabricSetup.run(OptifabricSetup.java:46) at java.util.ArrayList.forEach(Unknown Source) Please help

Use Fabric Loader 0.14.25, also next time please do a search to see if your issue has already been solved. If this solves your issue please close the ticket.

Just uninstall OptiFabric and optifine mods, i think it conflict with another mods. I recommend you to use Sodium and Iris shaders instead of optifine

It is not a conflict as it is just a wrong version of the loader.

java.lang.NoClassDefFoundError: net/fabricmc/tinyremapper/IMappingProvider at me.modmuss50.optifabric.mod.OptifabricSetup.run(OptifabricSetup.java:46) at java.util.ArrayList.forEach(Unknown Source) Please help

Use Fabric Loader 0.14.25, also next time please do a search to see if your issue has already been solved. If this solves your issue please close the ticket.

It doesn't works

java.lang.NoClassDefFoundError: net/fabricmc/tinyremapper/IMappingProvider at me.modmuss50.optifabric.mod.OptifabricSetup.run(OptifabricSetup.java:46) at java.util.ArrayList.forEach(Unknown Source) Please help

Use Fabric Loader 0.14.25, also next time please do a search to see if your issue has already been solved. If this solves your issue please close the ticket.

It doesn't works

Please do not hijack other's tickets and open your own ticket instead to be able to get support for your issue.