Minecraft RangSystem programming?

Hi, I get this error all the time:

Main:

RangCommand:

Config:

Thank you in advance for answers, I'm already desperate.

Could you please send the yaml?

Give it a try

Groups:
guest:
default: true
permissions:

Or

Groups:
guest:
default: true
permissions: zero

In 'string', line 4, column 18:

permissions: zero

it should only load so that I can then create a group via mc, permissions should become a list later, have already tried everything