Hello. I'm having some issues upgrading to Kotlin ...

# intellij

[Steffen Stenersen]

Hello. I'm having some issues upgrading to Kotlin 1.4 on my Zorin OS. Kotlin 1.3 is running just fine.
The problem occurs if I create new project with the ktor server template and try to use any collection operations.
(Same thing happens if I upgrade my existing projects to kotlin 1.4)

Gradle builds the project just fine, but in intellij I get unresolved reference on all kotlin collections.

I've tried different JVM versions without any luck.

intellij version: community 2020.2.3
SDK: I've tried with corretto 11, openjdk-8, openjdk-11.
OS: Zorin os 15.3

[Steffen Stenersen]

Everything works just fine if I try to run intellij on MacOS with the same project.

[Alexey Belkov [JB]]

I've seen similar https://youtrack.jetbrains.com/issue/KT-42929. Does it help to use a different dependency version like shown in the issue comments?

[Alexey Belkov [JB]]

It might also help to remove IDEA system cache, remove .idea directory, reimport the project into IDEA.

https://www.jetbrains.com/help/idea/tuning-the-ide.html#config-directory

[Steffen Stenersen]

Thanks. Removing system cache + idea directory did not work, but upgrading to 1.4.20-RC did work.
(I also tried to downgrade from kotlin 1.4.10 -> 1.4.0 without any luck).

It is a strange error, I suspect there exists some cache on my computer that messes things up, as the same project works on my mac.