Update app.py

app.py

@@ -228,7 +228,7 @@ class DataViewerApp:
         else :
             data=data[data['flag'] ==1]
             return self.set1(data),len(data)
-    def process_audio(index):
+    def process_audio(self,index):
         for i in range(len(self.sdata)):
             x, y = remove_nn(self.sdata[i])
             self.sdata[i]=y