Kotlin, unresolved reference on everything in VSCode

I installed Kotlin plugins for VSCode and created Hello World file `test.kt` but VSCode shows errors (it could be compiled via command line)

[![enter image description here][1]][1]


[1]:

I had this issue when I had both the Kotlin Language by mathiasfrohlich and Kotlin by fwcd extensions installed.

Uninstalling Kotlin by fwcd resolved the problem in my case.

if you have the first extension (**kotlin by fwcd**), **Uninstall** it and install the second I mean **by mathiasfrohlich**.

[![enter image description here][1]][1]


[1]:

I solved this issue by updating the Kotlin version that my build.gradle file referenced.

Bump the version number, then run build and the errors may magically disappear.