Minecraft Version: 1.10.2
Inventory Tweaks Version: 1.61-58
Iron Chest Mod version: 1.10.2-7.0.11.797

When pressing both line sort in the diamond chest it wont work and an error message comes up in the chat log.

The 2 buttons that has the error message pop up

This is error message

This has been since fixed, and isn't present in current versions. see 4165ce4

There are no plans to backport any fixes to older versions.