diff --git a/helper.py b/helper.py
index 7b750a7..8bbd640 100644
--- a/helper.py
+++ b/helper.py
@@ -16,7 +16,8 @@ def cs_render(cs_path,settings = {},hdf_path = ""):
 	- dictionary with settings (optional)
 	"""
 	
-	hdf=neo_util.HDF(hdf_path)
+	hdf=neo_util.HDF()
+	hdf.readFile(hdf_path)
 	for key in settings.keys():
 		hdf.setValue(key,str(settings[key]))
 	cs= neo_cs.CS(hdf)