" Property 'openKv' doesn't exist on 'typeof Deno'. "

I just tried to make a simple chat web, but, when im trying to use

Deno.openKv()

Deno.openKv()

the vscode says that

openKv

openKv

doesn't exist on 'typeof Deno', how to fix it? i have upgraded to 1.42.1 and have

deno.unstable

deno.unstable

set to true