新人求教 在仿照注册登录模块出现了问题

错误信息是：events.js:160 throw er; // Unhandled 'error' event ^

TypeError: Cannot set property 'error' of undefined at E:\jesus\routes\index.js:24:31 at Query. (E:\jesus\node_modules\mongoose\lib\model.js:3433:16) at E:\jesus\node_modules\kareem\index.js:273:21 at E:\jesus\node_modules\kareem\index.js:127:16 at _combinedTickCallback (internal/process/next_tick.js:67:7) at process._tickCallback (internal/process/next_tick.js:98:9)

然后出错的地方是这里：

先提前谢谢每个帮助解答问题的高手们！！