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The message literally tells you what the problem is and how to fix it

I know, sorry i missed adding the context, we are using composite build and have two convention plugins one with kotlin 1.6 plugin and other with kotlin 1.8 plugin. I tried changing everything to 1.8 but things but things are failing and given the size of the repo everything cannot be fixed in one shot.

That would probably then more be a question to the Kotlin Plugin developers. But as far as I remember you cannot mix different Kotlin Plugin versions in one build. If you were using composite builds, you could most probably use different KGP versions in those different builds, but not in different projects within the same build afair.