The way to fix it was only a tutorial for windows. Im on a MacBook Pro
Well the directory for the steam part is YourUser>Library>Application Support>Steam>Steamapps>Blockland
I am pretty sure not on a mac atm, but you can find it from there.
And the non-steam one is in your documents. and the copy and paste is the same with the addons but I am exactly sure what he said will work because I haven't tried it yet.