When I'm trying to choose an option from the select field in the Admin UI, I get this error message:

This is the part of the schema in my config:
caffeineSource: fields.select({
label: "Brühmaterial",
options: [
{ label: "Espresso", value: "espresso" },
{ label: "Kaffeepulver", value: "coffee" },
{ label: "Tee", value: "tea" },
],
defaultValue: "espresso",
})
When I'm trying to choose an option from the select field in the Admin UI, I get this error message:
This is the part of the schema in my config: