I was an idiot, the tutorial was garbage, sorry...

I think there is a time limit on how long one can actually run the app on a physical device with a free account, I used to have a free account and after some time the app will just stop running. I believe your only option now is to run it on a simulator or buy the Developer subscription...or if you find someway to delete the current certificate and reinstall a new one...

I think I see what you mean... import ExtraConverter let encoder = Encoder.init(source: myString) then in the package's contents make the class and constructors public is what solved the issue...