Fixed MPP documentation <ERROR CLASS> when platform code references
common code (for clean build, too)
diff --git a/gradle/dokka.gradle b/gradle/dokka.gradle
index f3ee03e..0166263 100644
--- a/gradle/dokka.gradle
+++ b/gradle/dokka.gradle
@@ -52,6 +52,7 @@
             }
             // depends on JS & Common, too
             afterEvaluate {
+                dependsOn(tasks.getByPath(":$project.name:classes"))
                 dependsOn(tasks.getByPath(":$project.name-js:classes"))
                 dependsOn(tasks.getByPath(":$project.name-common:classes"))
                 dependsOn(project.configurations.compileClasspath)