Update app.py

app.py

@@ -217,7 +217,7 @@ def bc_transactions(sender,recipient,amount):
 
 def create_chain(create=None):
     global blockchain
-    blockchain = Blockchain(create=create)
+    blockchain = Blockchain(main_chain=main_chain,create=create)
     #blockchain.reset(create=create)
     return "New Chain Created",None,display_chain()