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Uncaught (in promise) TypeError: Cannot read property 'length' of null

2022-02-04 00:18:03 Q & A of Denglian community

Hello , I'm also learning the blockchain of this topic , The problem I've had is this , Please tell me how to solve this problem , And mine event.preventDefault() It doesn't work , Click on Submit Bid Will jump to the interface , What's the reason , For help !!!!20210424103334.png20210424103437.png

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