Creating document from google sheets app script

Question

I'm trying to create a document using google app scripts from a sheet. I have the following function

function createDoc() {

 DocumentApp.create('TEST_DOCUMENT');

}

But when I run it I get the error

Exception: You do not have permission to call DocumentApp.create. Required permissions: https://www.googleapis.com/auth/documents (linje 26).

In my google app scripts appscript.json I've added

"oauthScopes": [
    "https://www.googleapis.com/auth/documents"
],

For the necessary permissions. But I'm still getting the same error. Anyone know why?

EDIT:

My createDoc() function (at the bottom)

How I call the createDoc() function

The error message

My appscript.json