Update app.py

app.py

@@ -448,7 +448,7 @@ def update(
         fixed_chain_list = re.sub("[^A-Za-z]+", ",", fixed_chain).split(",")
 
     chain_list = list(set(designed_chain_list + fixed_chain_list))
-    num_seq_per_target = num_seqs
+    num_seq_per_target = int(num_seqs)
     save_score = 0  # 0 for False, 1 for True; save score=-log_prob to npy files
     save_probs = (
         0  # 0 for False, 1 for True; save MPNN predicted probabilites per position