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Don't use a CommonProxy, it makes no sense. Proxies exist to separate sided only code. If your code is common it goes anywhere else but your proxy. This might be the cause of your issue, but Don't use this overload, it's deprecated. Use the one that takes in a Callable as it's last parameter. I think that this is the case of your issue since you don't provide a public parameterless constructor in your implementation. Don't use IHasModel?

Oh wait, I see now... Update your JDK

// the mappings can be changed at any time, and must be in the following format. // snapshot_YYYYMMDD snapshot are built nightly. // stable_# stables are built at the discretion of the MCP team. // Use non-default mappings at your own risk. they may not always work. // simply re-run your setup task after changing the mappings to update your workspace. mappings = "snapshot_20171003" Yeah, you're using the default ones. Either set up your gradle to download and remap Mekanism or use the same mappings as the deobf version of Mekanism that you already have

//FIXED Ok so it seems that ive fixed this problem by removing NEI and some other non-content mods which were probably the problem here. Ill leave it here if someone will have the same problem so he can fix it himself.

Could you provide your build.gradle?

They... are not expecting it to work the way you are expecting them to expect it to work(my, that's a confusing sentence). Look at their implementation: public ItemStack[] getResults(ItemStack input) { for(Map.Entry<ItemStack, ItemStack[]> entry : this.recipesList.entrySet()) { if(this.compareItemStacks(input, entry.getKey())) { return entry.getValue(); } } return null; } private boolean compareItemStacks(ItemStack stack1, ItemStack stack2) { return stack2.getItem() == stack1.getItem() && (stack2.getMetadata() == 32767 || stack2.getMetadata() == stack1.getMetadata()); } I mean yeah, there are better structures than a Map here, sure, but they can change it later.

By default the placement sound is played at 80% pitch in all methods it is referenced by (aka it goes like sound.getPitch() * 0.8F). You are playing it at 100%

Use a FOVUpdateEvent

Finished NoCubes (for the moment) https://github.com/Cadiboo/NoCubes Screenshots:

Try disabling the loading screen in .minecraft/config/splash.properties enabled=false