AllyTheOcelot {l Wrote}:this is a very unimportant and common error message
You are right, this comes everytime I launch the game.
After the bug appeared only on macOS and Windows systems, my fist assumption was a file system issue (case sensitive vs. case preserving).
But I found no files in the plugin, that might conflict with this.
Then I run some tests on different operating systems (Debian, macOS), architectures (x84-64, ARM64) and SuperTux versions (0.6.0 – 0.6.3; package and build by source) with the conclusion, that the bug seems to be dependent on the SuperTux version and appears in 0.6.2 and 0.6.3!
It is also visible in the worldmap editor where the different layers exists, but without images.
PS: @AllyTheOcelot – your levels (Grandmasters Journey) are really great, too. But I had no chance without cheating