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Suddenly all over my code I'm getting red lines complaining "The feature 'multi platform project' is experimental and should be enabled explicitly", even directly underneath the annotation @ExperimentalMultiplatform.

I've now added the compiler option -Xmulti-platform (via gradle, I use AS), but I still get the red lines.
Despite this the app builds and runs, although it crashes immediately, perhaps with a related error but I'm still tracking that down.

Can you pinpoint the last commit where you didn't have the issue and inspect what changed since then?

Good thought. Yes I can and yes I will :slightly_smiling_face:

<@U01KPMX8013> I have the same issue in my (brand new) project, did you find a fix?

I don't have this issue any more <@U8W1ASD60>, but I'm sorry to say I don't know what I did that fixed it :disappointed: . Does your code run?

I suspect it was something in build files (or is that too obvious to even say?). I *do* still have red lines everywhere, import statements complaining about not finding io.ktor and similar, but again the code builds and runs. <@UJQB4DJF7> pointed out that "plugins don't work in KMM", which seems too much of a blanket statement, but it does seem to me that they perhaps "don't work" to the extent of preventing ktlint seeing some thing.

Yah my code ran/runs, after mucking about for a whole day, I found that the latest Bumblebee AS 'fixes' the issue. I tried everything I could find/think of on the Chipmunk AS release, no dice.

I'll try to find a place to report the issue that makes sense. Doesn't seem like Jetbrains thinks its on their end, from the issues I found being closed and all. Maybe it's one of those "AS uses older components and it'll eventually be fixed" type deals.

<https://youtrack.jetbrains.com/issue/KT-27683> more like "plugins that aren't built for MPP, don't work with MPP" than "plugins don't work"