app.settings.setSetting is undefined

Hy guys,

I'm trying to use app.settings.setSetting() in order to save a string as this:

app.settings.setSetting("test", "keytest", "keyvalue");

I get this error:

Function app.settings.setSetting is undefined.

Any idea why?

app.settings.haveSetting is working.

I'm using AF CC 13.0, 2014,.