diff --git a/Tools/AutoClient/Modes/FolderStore/FileWorker.cs b/Tools/AutoClient/Modes/FolderStore/FileWorker.cs
index 063602f..37e52bd 100644
--- a/Tools/AutoClient/Modes/FolderStore/FileWorker.cs
+++ b/Tools/AutoClient/Modes/FolderStore/FileWorker.cs
@@ -1,5 +1,4 @@
 using Logging;
-using Nethereum.Contracts;
 
 namespace AutoClient.Modes.FolderStore
 {
@@ -22,6 +21,7 @@ namespace AutoClient.Modes.FolderStore
             this.instance = instance;
             this.purchaseInfo = purchaseInfo;
             sourceFilename = filename.File;
+            if (sourceFilename.ToLowerInvariant().EndsWith(".json")) throw new Exception("Not an era file.");
             this.onFileUploaded = onFileUploaded;
             this.onNewPurchase = onNewPurchase;
             codex = new CodexNode(app, instance);
diff --git a/Tools/AutoClient/Modes/FolderStore/JsonBacked.cs b/Tools/AutoClient/Modes/FolderStore/JsonBacked.cs
index d00581a..a9be798 100644
--- a/Tools/AutoClient/Modes/FolderStore/JsonBacked.cs
+++ b/Tools/AutoClient/Modes/FolderStore/JsonBacked.cs
@@ -12,6 +12,8 @@ namespace AutoClient.Modes.FolderStore
             Folder = folder;
             FilePath = filePath;
             LoadState();
+
+            app.Log.Debug("Deserialized state: " + JsonConvert.SerializeObject(State));
         }
 
         private void LoadState()