Generate world with definend chance of ores and licnese question

[Former user]

Hello,

When i'm trying to add the settings file the chance of finding ores, the server not starting. there is a different config for version 7.x.x? if yes can you please show me an example?

another question, if I want to clear old licenses from my plugin since I moved server, how can I do that?

Thanks for the help!