No such property: usedPackageDeps

Question

I use ext-6.5.1 (CMD 6.5.1.240) and changed my app.json to the following:

Code:

"production": {
    "output": {
        ...
        "js": {
             "filter": "used"
        }
        ...
    }
}

https://docs.sencha.com/cmd/7.5.0/guides/whats_new_cmd.html

After running

sencha app build production

I got this error:

[ERR] com.sencha.exceptions.ExNotFound: No such property : usedPackagesDeps

Any clue why this does occur and how to fix? The doc's aren't helping much.