Hello, we prefer avoiding this channel being a "debug my code" forum.
Also, that 404 error that you're getting is very unlikely to be related to Kotlin, and on Kotlin's Slack, the topic is always Kotlin, so it's off-topic, and I'm consequently asking you to move your question elsewhere (see the topic of this channel for pointers).
BTW, there's 37K+ users in this channel. I'll let you imagine if we all
rubber-ducked here.
Thanks for your understanding 🙂