diff --git a/platform/configuration-store-impl/src/FileBasedStorage.kt b/platform/configuration-store-impl/src/FileBasedStorage.kt
index 84896cb99fde..c08fa660cbc2 100644
--- a/platform/configuration-store-impl/src/FileBasedStorage.kt
+++ b/platform/configuration-store-impl/src/FileBasedStorage.kt
@@ -262,4 +262,4 @@ fun deleteFile(requestor: Any, virtualFile: VirtualFile) {
   runWriteAction { virtualFile.delete(requestor) }
 }
 
-internal class ReadOnlyModificationException(val file: VirtualFile, val session: StateStorage.SaveSession?) : RuntimeException()
\ No newline at end of file
+internal class ReadOnlyModificationException(val file: VirtualFile, val session: StateStorage.SaveSession?) : RuntimeException("File is read-only: "+file)
\ No newline at end of file