I have the same issue. Everytime I try to run on 1.8.9 forge with spiral lucky block, it crashes with this error:
The game crashed whilst there was a severe problem during mod loading that has caused the game to fail
Error: net.minecraftforge.fml.common.LoaderException: java.lang.IllegalArgumentException: The name lootplusplus:spiral.gingerbread_stairs has been registered twice, for Block{lootplusplus:spiral.gingerbread_stairs} and Block{null}.
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I have the same issue. Everytime I try to run on 1.8.9 forge with spiral lucky block, it crashes with this error:
The game crashed whilst there was a severe problem during mod loading that has caused the game to fail
Error: net.minecraftforge.fml.common.LoaderException: java.lang.IllegalArgumentException: The name lootplusplus:spiral.gingerbread_stairs has been registered twice, for Block{lootplusplus:spiral.gingerbread_stairs} and Block{null}.
I have no idea what to do. I need help.
Thank you.