跑不起来，提示如下。不知道是不是yarn版本的问题

[coconuta]

./src/App.js
Line 35:5: 'data' is not defined no-undef
Line 59:5: 'handleAddCard' is not defined no-undef
Line 78:2: 'removeNode' is not defined no-undef
Line 89:5: 'handleMove' is not defined no-undef

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