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                                            Lin Liu

TypeError: argument of type 'NoneType' is not iterable

I have following error: ERROR in app: Exception on /transactions/new [POST] File "C:/Users/小草/Downloads/Compressed/blockchain-master/blockchain-master/blockchain.py", line 237, in new_transaction if not all(k in values for k in required): File "C:/Users/小草/Downloads/Compressed/blockchain-master/blockchain-master/blockchain.py", line 237,...