diff --git a/plugins/simple-io-plugin/FileListenerWorker.cs b/plugins/simple-io-plugin/FileListenerWorker.cs
index 5f0028a..6b382b8 100644
--- a/plugins/simple-io-plugin/FileListenerWorker.cs
+++ b/plugins/simple-io-plugin/FileListenerWorker.cs
@@ -100,7 +100,7 @@ Action<object, object, object> notifierDelegate
       _dirPath = path;
       try {
         if (!DirctoryExists(path)) {
-          callback(id, false, $"Can't find directory ${path}");
+          callback(id, false, $"Can't find directory {path}");
           return;
         }