Hello. I am currently struggling with another issue regarding Kotlin MPP. I am unable to successfully execute a request using Ktor on iOS. It always throws an InvalidMutabilityException. I have a vague understanding of the mutability aspect, but can't figure out why it's being thrown on Ktor. From iOS

kotlin.native.concurrent.InvalidMutabilityException: mutation attempt of frozen io.ktor.client.request.HttpRequestPipeline@3f59548

I've tried downgrading to Kotlin 1.3.10, as that seemed to be suggested on SO. However, it still throws the same exception. Kotlin 1.3.11/10 Ktor 1.1.1 Coroutines 1.1.0

I had the same issue. Downgrading to kotlin 1.3.10 worked for me. Although i was using Ktor 1.0.1 and Coroutines 1.0.1 also.

@Drew did you resolve this? also seeing this with kotlin 1.3.21 ktor 1.1.3 coroutines 1.1.1

@Patrick Jackson I think I did figure it out on my end. I believe it was because my Ktor client was being held in a global object

in my case I was not using the mainthread on iOS. I had to switch to using a CoroutineDispatcher that dispatches everything on the main queue.