diff --git a/build/groovy/org/jetbrains/intellij/build/impl/BuildTasksImpl.groovy b/build/groovy/org/jetbrains/intellij/build/impl/BuildTasksImpl.groovy
index 9477ca6c6d50..55587d3b7453 100644
--- a/build/groovy/org/jetbrains/intellij/build/impl/BuildTasksImpl.groovy
+++ b/build/groovy/org/jetbrains/intellij/build/impl/BuildTasksImpl.groovy
@@ -327,14 +327,14 @@ idea.fatal.error.notification=disabled
   private void checkModules(Collection<String> modules, String fieldName) {
     def unknownModules = modules.findAll {buildContext.findModule(it) == null}
     if (!unknownModules.empty) {
-      buildContext.messages.error("The following modules from $fieldName aren't found in the project.")
+      buildContext.messages.error("The following modules from $fieldName aren't found in the project: $unknownModules")
     }
   }
 
   private void checkProjectLibraries(Collection<String> names, String fieldName) {
     def unknownLibraries = names.findAll {buildContext.project.libraryCollection.findLibrary(it) == null}
     if (!unknownLibraries.empty) {
-      buildContext.messages.error("The following libraries from $fieldName aren't found in the project.")
+      buildContext.messages.error("The following libraries from $fieldName aren't found in the project: $unknownLibraries")
     }
   }