I was leveling the floor of my mine today on the tile next to the entrance and got an error message.
[12:21:27] The roof sounds dangerously weak and you must abandon this attempt.
This same error also happened when i tried to flatten the tile. I was able to mine it down manually and get it level but thought i would post it anyway and i am not sure if this is a bug or is intended because it is on the tile next to the entrance.