I need help again!
yo bro,
I made changes in the files,
but still am getting this problem!
pls help!

Please be a bit more descriptive in your issue titles next time :smile:
I can't really say much about that error without seeing the code, but it seems like your terrain generation in world.py is adding blocks which are out of range (i.e., your block types don't go beyond the ID it's adding).
I kind of do expect/assume a certain background in Python in my series, so perhaps it'd be best if you got yourself a bit more comfortable with the language before coming back to it! Otherwise, if you just want to play around with/modify the game, you can always just clone from this repo directly.
Closing this issue :)