UI addon text not working on iOS

Hi this is a really simple problem but i just can’t seem to solve it;
all i’m trying to do is set up a label with some text in it, for testing purposes heres the code i’m using:

gui = new ofxUICanvas();
gui->addLabel("THis is a label");

the exact same code works when i run it on the OSX version of openframeworks

but when i run it in iOS i get this error:

[ error ] ofTrueTypeFont: drawString(): font not allocated: line 1077 in /Users/sammcgrail/Documents/OpenFrameWorks/libs/openFrameworks/graphics/ofTrueTypeFont.cpp

I’ve tried adding all the .ttf files that OF uses to the bin folder of my project but its still not working, can someone help me please!?