[1.12.2] noClassDefFound with Optional.Interface

[MrJake]

Hi,

 

I'm trying to make my mod OpenComputers-compatible, but only as a soft-dependency. But the game keeps crashing when I try to place the block with this TileEntity: https://github.com/MrJake222/AUNIS/blob/master/src/main/java/mrjake/aunis/tileentity/StargateBaseTile.java

 

What am I doing wrong here?

EDIT:

Crash: https://pastebin.com/qkcYTeri

Edited July 20, 2019 by MrJake

[MrJake]

Sorry, I've updated my master branch.

 

https://github.com/MrJake222/AUNIS/blob/98f04c1373c63c6f15bd69aa259c14c9d7eed478/src/main/java/mrjake/aunis/tileentity/StargateBaseTile.java