Thank you for playing Craftopia.
Several users have reported the bug that no NPCs and Mobs spawned in the game since the latest major update on February 10th. This bug might be caused when it failed to download the updating files of Craftopia from Steam.
The problem might be fixed by following the instruction below to redownload the missing or corrupted files.
Steam Library > Craftopia > Properties > Local Files > Verify integrity of game files
Thank you for your sincere continuous supports.