Unfortunately, I'm not entirely certain how this one came about. I first encountered it after attempting to place a node on a modded furnace in order to read the status, but it only crashed once and then allowed me to rejoin the world. I removed the furnace and placing a different block there instead, but after a long, seemingly random amount of time the game abruptly crashed again with the same error. This crash now happens every time the world loads, making it impossible to use this save.

https://paste.dimdev.org/zagowuluve.mccrash

Unfortunately, I'm not entirely certain how this one came about. I first encountered it after attempting to place a node on a modded furnace in order to read the status, but it only crashed once and then allowed me to rejoin the world. I removed the furnace and placing a different block there instead, but after a long, seemingly random amount of time the game abruptly crashed again with the same error. This crash now happens every time the world loads, making it impossible to use this save.

https://paste.dimdev.org/zagowuluve.mccrash

This happens to me with Mekanism sometimes as well. When Mekanism machines are set to auto-output to the Ultimate Pipes, it will cause a completely world-breaking glitch.

To fix it, you have to use MCEdit and go in and delete the block(s). You will have to know exactly where the block is however, in order to delete it.