diff --git a/build/scripts/utils.gant b/build/scripts/utils.gant
index 2f711c0c46c2..ba0b85bbc7a7 100644
--- a/build/scripts/utils.gant
+++ b/build/scripts/utils.gant
@@ -139,7 +139,7 @@ binding.setVariable("loadProject", {
     bundledKotlinPath = "$home/community/build/kotlinc"
   }
   if (!new File(bundledKotlinPath, "lib/kotlin-runtime.jar").exists()) {
-    projectBuilder.error("Could not find Kotlin runtime at $bundledKotlinPath/lib/kotlin-runtime.jar")
+    projectBuilder.error("Could not find Kotlin runtime at $bundledKotlinPath/lib/kotlin-runtime.jar: run download_kotlin.gant script to download Kotlin JARs")
     return
   }
   setPathVariable("KOTLIN_BUNDLED", bundledKotlinPath)