Game crashes as soon as world loads in Shivaxi RLCraft modpack

[Underscore]

It was as simple as that. The game closed immediately after the world generated in the Shivaxi RLCraft modpack. The console says, "java.lang.OutOfMemoryError." I have no idea what is happening, I just want to play this modpack but nothing at all is working right anywhere. Your basic answers will probably not solve the issue.

[JaariAtmc]

"java.lang.OutOfMemoryError"

That means you have to allocate more RAM. Launcher Options > Java Settings. And please don't say you got 32-bit java.

[Metr0nic]

how do you get 64-bit java