Label change font

Hi.

I am trying to create a label with a TTFFont I am using. The TTF-Font is working because I am using it also in cocos studio 2.1.

I am creating it like this:

self.label = cc.Label:createWithTTF("", "assets/fonts/kenvector_future_thin.ttf", 12)

Sadly the font isn’t used and its a default font.

It’s not working on windows and on android. I am using cocos2d-x 3.4 final.
I get following information in the cocos code ide console: Currently only supported on iOS and Android!

What is strange : The font is working when it’s set inside of cocos studio. So it is supported? o.O

Thanks for helping.