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TypeError: params.outputStream.on is not a function

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2018-09-26 08:34 +08:00: TypeError: params.outputStream.on is not a function at COS._submitRequest (/wiz/app/wizserver.20180925.1736/node_modules/cos-nodejs-sdk-v5/sdk/base.js:2268:29) at /wiz/app/wizserver.20180925.1736/node_modules/cos-nodejs-sdk-v5/sdk/base.js:2061:24 这个是什么错误？