need help with error fixing

I decompiled ic2 client very hard, but there are a lot of errors in the code. please help me to fix. example:

keyBindingContainers = Multimaps.newMultimap(Maps.newHashMap(), new ModLoaderClientHelper$1(this));

I get this error:

The method newMultimap(Map<K,Collection<V>>, Supplier<? extends Collection<V>>) in the type Multimaps is not applicable for the arguments (HashMap<Object,Object>, ModLoaderClientHelper$1)

and I don't know how to fix it. It's hard and errors is so lot.

I tried make mods for Minecraft, I just changed explosition physics in regular Minecraft. So no say that I don't know how to code. Java very resemble with C++, and i easy changed explosition physics (obsidian can be exploded, but with very small chance). So i can code. And i have good ideas for IC2 addon.

Sorry for bad grammar, I'm Russian.