Danebi

Use the set method on the data manager.

Yes.

When do you call the register method?

Wouldn't it be "set"?

No, the debug.log is a file in .minecraft\logs.

Post your code (in a github repository) and your full debug.log (You can find it in run\logs).

Don't ask for the crash report. The debug.log has more info. You posted the console log. You have to post the debug.log (A file located in the logs folder).

Just to be sure, where did you download the mod from?

Try to delete this file: C:\Users\Harrison\AppData\Roaming\.minecraft\config\fml.toml.

Try to delete this file: C:\Users\Anton\AppData\Roaming\.minecraft\config\forge-client.toml.

Install Java. If it still doesn't work run jarfix.

Post the new debug.log.

Do you have a line like this? VANILLA_ITEMS.register(FMLJavaModLoadingContext.get().getModEventBus());

Are you registering VANILLA_ITEMS on the mod bus?

Post the installer log.

1) You aren't providing the required parameters of the constructor. 2) If you already called the super constructor with hardcoded parameters(except for slots), why in your constructor are you requesting these arguments? 3) Your constructor is protected and the two classes are not in the same package. Set it to public.

Can you show your DoubleDrops class?

So you read the rules and decided to ignore them, right?

It seems like you started a vanilla server. Post the server logs.

Just post the debug.log.

In your log there should be an error, can you post it here?

You forgot the 'gui' folder.

The file is unavailable.