Minecraft not recognizing Datapack

I'm trying to make a Datapack that changes the In-game advancements, but the Datapack isn't showing up in the Datapack menu in world creation, or in /datapack list. Advancements+\data\minecraft\advancement\minecraft { "pack": { "pack_format": 71 "description": "Advancement test" } } Is there anything obviously wrong with my Datapack?