老师我挖矿的时候一直提示这个错误，帮我看一下吧

来源：3-8 挖矿接口实现

慕UI6354368

2018-05-25

#postman提示：
#<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
#<title>500 Internal Server Error</title>
#<h1>Internal Server Error</h1>
#<p>The server encountered an internal error and was unable to complete your request. 
# Either the server is overloaded or there is an error in the application.</p>


#    'previous_hash': previous_hash or self.hash(self.last_block[-1]),
#KeyError: -1
#127.0.0.1 - - [25/May/2018 09:52:18] "GET /mine HTTP/1.1" 500 -

def new_block(self,proof,previous_hash=None):
    block = {
        'index': len(self.chain) + 1,
        'timestamp': time(),
        'transacations': self.current_transactions,
        'proof': proof,
        'previous_hash': previous_hash or self.hash(self.last_block[-1]),
    }
    self.current_transactions = []
    self.chain.append(block)
    return block

@app.route('/mine',methods=['GET'])
def mine():
    last_block = blockchain.last_block
    last_proof = last_block['proof']
    proof=blockchain.proof_of_work(last_proof)

    blockchain.new_transaction(sender="0",recipient=node_identifier,amount=1,)

    block = blockchain.new_block(proof,None)

    response = {
        "message": "New Block Forged",
        "index": block['index'],
        "transaction": block['transactions'],
        "proof": block['proof'],
        "previous_hash": block['previous_hash']
    }

    return jsonify(response),200

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