Fix experimental error

app.py

@@ -269,12 +269,18 @@ def run():
     mode = st.sidebar.radio("Mode", ["Overview"])
     demonstration_dir = "./demonstrations"
 
-    params = st.experimental_get_query_params()
+    # params = st.experimental_get_query_params()
+    params = st.query_params
+    print(params)
+    
     # list demonstrations/
     demo_names = os.listdir(demonstration_dir)
 
     if params.get("recording"):
-        recording_name = params["recording"][0]
+        if isinstance(params["recording"], list):
+            recording_name = params["recording"][0]
+        else:
+            recording_name = params["recording"]
 
     else:
         recording_name = demo_names[0]
@@ -286,7 +292,9 @@ def run():
     )
 
     if recording_name != params.get("recording", [None])[0]:
-        st.experimental_set_query_params(recording=recording_name)
+        # st.experimental_set_query_params(recording=recording_name)
+        # use st.query_params as a dict instead
+        st.query_params['recording'] = recording_name
 
     if mode == "Overview":
         with st.sidebar: