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/Users/user/Documents/self/apps/blog/node_modules/hexo-deployer-ftpsync/node_modules/ftpsync/node_modules/async/lib/async.js:43
            if (fn === null) throw new Error("Callback was already called.");
                                   ^
Error: Callback was already called.
    at /Users/user/Documents/self/apps/blog/node_modules/hexo-deployer-ftpsync/node_modules/ftpsync/node_modules/async/lib/async.js:43:36

用hexo-deployer-ftpsync的时候报错，ftp服务器是ubuntu。

用客户端上传是可以的。

我知道了，是因为设置参数的时候： remote: ./demo 必须这样设置。