Update app.py

app.py

@@ -227,7 +227,7 @@ def get_start_index():
         files = hf_fs.ls(output_repo_path + '/' + get_base_path())
         return len(files) -1
     else:
-        return -2
+        return -1
 
 def read_data():
     with hf_fs.open(input_repo_path + '/' + to_annotate_file_name) as f: