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kotlinlang

I'm getting an error with gradle:
 - Variant 'testRuntime' capability mystuff:api-library:unspecified:
              - Unmatched attributes:
                  - Required org.gradle.category 'platform' but no value provided.
                  - Required org.gradle.dependency.bundling 'external' but no value provided.
                  - Required org.gradle.jvm.version '12' but no value provided.
                  - Required org.gradle.usage 'java-api' but no value provided.
                  - Found org.jetbrains.kotlin.localToProject 'local to :api-library' but wasn't required.
              - Compatible attribute:
                  - Required org.jetbrains.kotlin.platform.type 'jvm' and found compatible value 'jvm'.

Cannot choose between the following variants of project :api-library:
          - compile
          - default
          - runtime
          - testCompile
          - testRuntime

compile(platform(project(":api-library", configuration="default")))

seems to solve it, not sure why, how though…

To the people just answering with SO and google emojis (useful thank you…) , all I found was related to android problems and nothing explained clearly what happened.