问Python以太坊智能合约开发指南最后一个函数报错IndexError？

报错如下：

Traceback (most recent call last):

File "D:/NlBlock/text.py", line 33, in <module>

LC.submit_a_superblock(str(new_block.stringify_block()))

File "D:\NlBlock\e.py", line 199, in submit_a_superblock

.format(processed_receipt[0].args.sender, processed_receipt[0].args.superblock)

IndexError: tuple index out of range

代码如下：

processed_receipt = contract.events.SuperblockSubmission().processReceipt(tx_receipt)

print(processed_receipt)

output = "Address {} broadcasted the opinion: {}" \

.format(processed_receipt[0].args._soapboxer, processed_receipt[0].args._opinion)

print(output)

完整代码为Python以太坊智能合约开发指南（https://blog.csdn.net/weixin_34356310/article/details/93025947）