FOSS gamedev and creative worlds

i got this error message sometimes and then my worls missed stones an averything is broken..... is this a known bug or something happens too my minetest..... is use aktually version and streets mod with mese.

thanks for your help and sorry for my bad english

May you show the debug.txt file? At least 50 lines. It is useful.

This is probably due to being out of disk space, or it's trying to write to a read only area.

What operating system (Windows, Linux, etc) are you on, and where did you install Minetest to?