Welcome Liam.
You are attempting to do this tutorial BOT. Therapist Bot Tutorial .
Are you using any extensions. This app will not run as an ios app because the ios interpreter cannot use extensions. If that is not the case, share the code you have used so far as one of the steps is tripping a bug. It is impossible to guess which one without seeing what you have coded so far.
The problem is probably using dictionaries with ios. Please read JsonTextDecodeWithDictionaries Supported in IOS?
Be aware, MIT indicated in Nov. 2021 that.
Which version of Companion for ios are you using?