Update app.py

app.py

@@ -316,7 +316,7 @@ def mychain_mine_block_send(balance, chain_r=None,chain_n=None):
     previous_proof = previous_block['proof']
     proof = mychain_send.proof_of_work(previous_proof)
     previous_hash = mychain_send.hash(previous_block)
-    block = mychain_send.create_block(balance, proof, previous_hash,len(blockchain.chain)+1,chain_r,chain_n)
+    block = mychain_send.create_block(balance, proof, previous_hash,len(bc_utils.blockchain.chain)+1,chain_r,chain_n)
 
     response = {'message': 'A block is MINED',
                 'index': block['index'],
@@ -342,7 +342,7 @@ def mychain_mine_block_trans(balance, chain_r=None,chain_n=None):
     previous_proof = previous_block['proof']
     proof = mychain_trans.proof_of_work(previous_proof)
     previous_hash = mychain_trans.hash(previous_block)
-    block = mychain_trans.create_block(balance, proof, previous_hash,len(blockchain.chain)+1,chain_r,chain_n)
+    block = mychain_trans.create_block(balance, proof, previous_hash,len(bc_utils.blockchain.chain)+1,chain_r,chain_n)
 
     response = {'message': 'A block is MINED',
                 'index': block['index'],