How can I solve this? Gradle: 7.2, Intellij: 2021.2.2, Kotlin: 1.5.30, Kotlin IDE plugin: 212-1.5.30-release-409-IJ4638.7 I tried,

rm -rf ~/.gradle/caches

and Invalidate Caches and restart on Intellij

This looks like a compiler frontend bug. Do you get it when opening a particular file? Try commenting out code to pinpoint the exact code pattern that is causing the bug. Then rewrite this code in some different way. If possible, please report this bug with sample code to reproduce to http://kotl.in/issue