There is a moderately annoying bug in Android, Amazon and iOS versions of the game. Windows Phone is unaffected. Somehow it slipped through the release sieve. When importing a world that has a blocks texture or character skin set, these will not be imported correctly and “Error loading texture” message will be displayed. Sometimes the world may even fail to download properly and be corrupted.
I have reproduced and fixed this bug. I will likely release a bugfix update soon.