Hi there! Could you please try the following steps?
Close the file and exit Avorion.
Open "server.ini" again, change "MinimumBlockSize=", then save and close it.
Start Avorion.
Let me know how it goes!
Feel free to reach out if you need any more help!
EDIT: I noticed the screenshot is showing the "server.ini - readme.txt" file—which is just the documentation. That means any changes made there won’t affect your game. To update the options, you'll need to edit the actual "server.ini" file.