FlaskでのAttributeError: 'tuple' object has no attribute 'keys'のエラーについて

FlaskでWEBアプリケーションにチャレンジしています。

formから値を受け取り、送信ボタンを押すとエラーが出ます。

Traceback (most recent call last):
  File "/usr/lib/python3.8/site-packages/flask/app.py", line 2446, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/lib/python3.8/site-packages/flask/app.py", line 1951, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/lib/python3.8/site-packages/flask/app.py", line 1820, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/lib/python3.8/site-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/usr/lib/python3.8/site-packages/flask/app.py", line 1949, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/lib/python3.8/site-packages/flask/app.py", line 1935, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/ULUNTA/mysite/aggregate_app.py", line 91, in read_csv
    tx  = facade.transaction_factory.create_embedded({
  File "/home/ULUNTA/.local/lib/python3.8/site-packages/symbolchain/core/symbol/TransactionFactory.py", line 85, in create_embedded
    return self._create(transaction_descriptor, sc.EmbeddedTransactionFactory)
  File "/home/ULUNTA/.local/lib/python3.8/site-packages/symbolchain/core/symbol/TransactionFactory.py", line 53, in _create
    processor.copy_to(transaction, ['type', 'signer_public_key'])
  File "/home/ULUNTA/.local/lib/python3.8/site-packages/symbolchain/core/TransactionDescriptorProcessor.py", line 39, in copy_to
    value = self.lookup_value(key)
  File "/home/ULUNTA/.local/lib/python3.8/site-packages/symbolchain/core/TransactionDescriptorProcessor.py", line 24, in lookup_value
    value = self._lookup_value_and_apply_type_hints(key)
  File "/home/ULUNTA/.local/lib/python3.8/site-packages/symbolchain/core/TransactionDescriptorProcessor.py", line 18, in _lookup_value_and_apply_type_hints
    value = self.type_parsing_rules[type_hint](value)
  File "/home/ULUNTA/.local/lib/python3.8/site-packages/symbolchain/core/symbol/ExtendedTypeParsingRules.py", line 44, in parser
    return list(map(element_rule, values))
  File "/home/ULUNTA/.local/lib/python3.8/site-packages/symbolchain/core/symbol/ExtendedTypeParsingRules.py", line 99, in parser
    struct_processor.copy_to(struct_obj)
  File "/home/ULUNTA/.local/lib/python3.8/site-packages/symbolchain/core/TransactionDescriptorProcessor.py", line 32, in copy_to
    for key in self.transaction_descriptor.keys():
AttributeError: 'tuple' object has no attribute 'keys'

ローカル（VScode)ではうまくいったのですが、
pythonanywhereではうまくいきません。

@app.route('/form', methods=['GET', 'POST'])
def read_csv():
    try:
      if request.method == 'POST':
          network = request.form['radio']
          #Mainnet MozaicID:0x6BED913FA20223F8
          MozaicID16 = int("0x" + request.form['MozaicID'], 16)
          MozaicID = request.form['MozaicID']
          msg0 = request.form.get('msg0')
          msg = msg0 or "" 
          print(msg)
          send_data = request.files['send_data']
          key = request.form['key']
          if send_data and allowed_file(send_data.filename):
              filename = secure_filename(send_data.filename)
              send_data.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))
              nf = pd.read_csv('uploads/' + filename, encoding="UTF-8", sep=",").values.tolist()
              nf_Q = len(nf)
              print(nf)

              #print(network+ MozaicID)
              if network == "Testnet_XYM" and nf_Q < 101:
                  ### 設定 #####################################################################################################################################################
                  # 送信元ウォレットの秘密鍵
                  private_key = key
                  
                  # トランザクション送信に使う手数料(少ないと送金できない)
                  fee_size    = 1
                  
                  # 宛先リスト
                  toList = nf
                  #############################################################################################################################################################
                  
                  # testnetで実施
                  facade = SymbolFacade('testnet')
                  
                  # 送信元の設定
                  Prikey     = PrivateKey(unhexlify(private_key))
                  Keypair    = KeyPair(Prikey)
                  Pubkey     = Keypair.public_key
                  Address    = facade.network.public_key_to_address(Pubkey)
                  #print("send from :", Address)
                  
                  # 受信先の設定
                  addressTx = []
                  for to in toList:
                      address = SymbolFacade.Address(to[1])
                      mosaic_size = to[2]
                      tx  = facade.transaction_factory.create_embedded({
                          'type': 'transfer',
                          'signer_public_key': Pubkey,
                          'recipient_address': address,
                          'mosaics': [(MozaicID16, int(mosaic_size * 1000000))],
                          'message': bytes(1) + msg.encode('utf8')
                      })
                      addressTx.append(tx)

わかる方いれば教えて下さい。