[SOLVED] [1.12.2] Accessing ops.json file crashes client

Hey,

I've been trying to OP a player with a specified permission level. So I just copied the code from PlayerList::addOp(GameProfile profile); and just tweaked the permission level. However, when I log on a dedicated server, the client crashes.
Code  blocks: https://pastebin.com/cjekvJU8

Note: in the paste, SERVER is FMLCommonHandler.instance().getMinecraftServerInstance();

Crash report: https://pastebin.com/xi9itUPp

I guess it's because I'm accessing ops.json in the wrong way. If so, how would I access it to add an entry with a custom permission level??

Any help is appreciated. If you need more code, please let me know.

Thanks!

EDIT 1: Getting MinecraftServer instance from EntityLivingBase::getServer(); and instead of making an instance for the file, I access it from PlayerList.FILE_OPS. No crash report. Going to try custom command.

EDIT 2: The command doesn't work. Is there anything I'm doing wrong? Am I not allowed to OP a player to an integer less than the OP permission level?

EDIT 3: Oh oops, I'm creating a new instance of UserListOps...

EDIT 4: Solved.

Edited September 8, 20196 yr by Differentiation