Board Thread:Bug Reports/@comment-26296200-20160416133302/@comment-25330335-20160417133217

Make sure your forge is updated. If you are running any other mods, I suggest removing those just so that you can load the world, (as long as those mods don't include other blocks), then put them back in. However, my suite of 14 or so worked just fine. Make sure you have more than 1GB of RAM allocated to Minecraft as well.

 SamwiseFilmore (Admin) (Fill My Mailbox)