AM TRYING TO MAKE A PATH PAYMENT OF XLM TO USD IN PYTHON BUT GETTING THE ERROR json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

Question

def sendPathPayment(): try: _json = request.json _amount = _json['amount'] _senderPubKey = _json['sender_pubKey'] _senderSecKey = _json['sender_secKey'] _senderAssetCode = _json['sender_assetCode'] _receiverPubKey = _json['receiver_pubKey'] _receiverSecKey = _json['receiver_secKey'] _receiverAssetCode = _json['receiver_assetCode']

        server = Server(horizon_url="https://horizon-testnet.stellar.org")
        source_keypair = Keypair.from_secret(_senderSecKey)

        source_account = server.load_account(account_id=_senderPubKey)

        # # checking user stellar wallets
        server = Server("https://horizon-testnet.stellar.org")
        account = server.accounts().account_id(_receiverPubKey).call()
        balances = account['balances']
        assetIss = ""
        for bal in balances:
            if bal['asset_type'] != "native":
                if _receiverAssetCode == bal['asset_code']:
                    assetIss = bal['asset_issuer']
            print(assetIss)
        # DISPLAY ORDERS
        order_data = requests.get("https://horizon-testnet.stellar.org/offers?buying=" + _receiverAssetCode + ":" + assetIss + "&selling=" + _senderAssetCode)
        order_res = order_data.json()
        print(order_res)

        receiver_amount = order_res['_embedded']['records'][0]['amount']
        print(receiver_amount)
        
        

        transaction = ( 
            TransactionBuilder(
                source_account=source_account,
                network_passphrase=Network.TESTNET_NETWORK_PASSPHRASE,
                base_fee=100,
            )
            .append_path_payment_strict_send_op(
                destination= _receiverPubKey,
                send_asset= Asset(_senderAssetCode, _senderPubKey),
                send_amount=_amount,
                dest_asset=Asset(_receiverAssetCode, _receiverPubKey),
                dest_min=receiver_amount,
            )
            .set_timeout(30)
            .build()
        )
        transaction.sign(source_keypair)
        res = server.submit_transaction(transaction)
       
        response = make_response(403, res['extras']['result_codes'])
        return response
        
    except Exception as e:
        data = json.loads(str(e))
        response = make_response(403, data['extras']['result_codes'])
        return response