I was going to add another building to my one command block machine, but the /fill command that triggers the building process, didn't work. The output was something that (normally) can't occur when executing a /fill command.
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The command is seen in the picture (fill ~1 ~-24 ~ ~1 ~-1 ~ redstone_block)
The complete error message: [20:53:18] The number you have entered (-2.0) is too small, it must be at least 0
The command should set a bunch of redstone blocks that build a tnt cannon and then delete themselves.
You're trying to place blocks into the void. Build your contraption higher or don't go 24 blocks down in your command.
Works fine for me. Please provide the exact command you used and the full error message you received.