ROM Hack Help with NSMB2 Coinkiller Importing tilesets

[Jackson Ferrell]

Hi guys, would someone be able to tell me how to properly use the tileset imports? I moved them to the Units folder, used Coinkiller and changed the tileset to a custom tileset .sarc I downloaded, but when I load up the ROMFS with the 3DS and go into the level, it freezes.
Just to make sure I changed the tileset back and loaded it up, and it works fine.
Any help with this would be appreciated.
Thanks