Kotlin files not able to use R.java

Question

I created a new layout file in the appropriate resource folder. After syncing, when I try to reference the layout file, i.e. R.layout.activity_test, R is an "unresolved symbol". When I try to build in AS it fails.

The interesting thing is that if I manually import the R file and use it in code, when I try to build on command line, it works. The other thing is when I try to access the layout file using R in a Java file, that also works. So I know R.java is being generated.

I tried creating a totally new project, and R is accessible in Kotlin files.

What is the problem here?

Things I have tried:

• Cleaned then built

• Invalidated Caches / Restart

• Blow away .gradle folders and recreate indexes

Other info:

• AS v3.0.1

• Tried both Kotlin v1.1.2-4 and v1.1.60

• Gradle v4.2.1

• Gradle Plugin v3.0.0

Answer 1

Invalidate Caches/Restart worked for me.

Runtime JAR files in the classpath should have the same version. These files were found in the classpath:
C:/Users/R3ZA/.gradle/caches/modules-2/files-2.1/me.eugeniomarletti.kotlin.metadata/kotlin-compiler-lite/1.0.3-k-1.2.40/a16e967c276379eaf6e1fa03af77664f003db947/kotlin-compiler-lite-1.0.3-k-1.2.40.jar (version 1.2)
C:/Users/R3ZA/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib/1.3.20/eb2a232734e09fcd1b958a5c7520a93c6de38b32/kotlin-stdlib-1.3.20.jar (version 1.3)
C:/Users/R3ZA/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-common/1.3.20/7d7934e26ce34da1a0a8d00e38038d7cf3375e89/kotlin-stdlib-common-1.3.20.jar (version 1.3)