Update app.py

app.py

@@ -333,9 +333,11 @@ def merge_trans():
     trans_bx = []
     previous_post_send = mychain_send.print_previous_block()
     previous_post_rec = mychain_rec.print_previous_block()
-    
+    prev_block = len(blockchain.chain)-1
+    previous_block = blockchain.chain[prev_block]             
+
     send_block = {
-            'block': blockchain.print_previous_block,
+            'block': previous_block["index"]+1,
             'role': 'Sender',
             'name': previous_post_send['transactions'][0]['sender'],
             'index': previous_post_send['index'],
@@ -346,7 +348,7 @@ def merge_trans():
             'proof': previous_post_send['proof'],
             'previous_hash': previous_post_send['previous_hash']}
     rec_block = {
-            'block': blockchain.print_previous_block,    
+            'block': previous_block["index"]+1,    
             'role': 'Recipient',
             'name': previous_post_rec['transactions'][0]['recipient'],
             'index': previous_post_rec['index'],