Hi, on a project I have this, and it never disappear, what is it at first ? and how do I remove it ? I have this error on a lot of properties and it's really annoying as I just can't work. I tried to reload gradle, refresh dependencies, restart intellij, restart intellij with reloading indexes, close intellij, remove

.idea

folder then reopen the project, reinstall gradle, and I still have it...

See https://youtrack.jetbrains.com/issue/KTIJ-19504. As a workaround you can use Kotlin IDE plugin 2021.2 with 1.5.10 compiler.

JetBrains TeamCity 2 Sep 2021 18:25

Target versions: 2021.2-1.5.31

Fix in builds: 212-1.5.31-460-IJ4638.7

Unfortunately, the workaround mentioned above does not always work. As of now, neither IntelliJ nor the plugin page show the fixed version. Could you provide an estimate when the fix will be published?

Kotlin compiler 1.5.31 will be released approximately next week, so the IDE plugin based on that should be released around the same time.