问当我尝试通过注册用户登录时，它显示此错误

EN

这就是我所面临的错误，我正在做一个小项目，用youtube的链接-- https://www.youtube.com/watch?v=Zzs2CzovhEI&list=PLUVqY59GNZQP8SlrFewicML2dSAUxBfAS可以更好地解释这个错误。

我在第四节课上发现错误

无法读取未定义的toString的属性“”TypeError“”：无法在下一个(C:\Users\RadheKrishna\Desktop\RPROJECT\Rproject\node_modules\express\lib\router\route.js:的C:\Users\RadheKrishna\Desktop\RPROJECT\Rproject\routes\index.js:49:31的LocalStorage.setItem Layer.handle读取未定义的as handle_request的属性“”toString“”137:13)在C:\Users\RadheKrishna\Desktop\RPROJECT\Rproject\node_modules\express\lib\router\index.js:281:22 at Route.dispatch (C:\Users\RadheKrishna\Desktop\RPROJECT\Rproject\node_modules\express\lib\router\index.js:的Layer.handle as handle_request at Function.process_params Function.process_params335:12)在路由器(C:\Users\RadheKrishna\Desktop\RPROJECT\Rproject\node_modules\express\lib\router\index.js:47:12) at Layer.handle的Function.handle (C:\Users\RadheKrishna\Desktop\RPROJECT\Rproject\node_modules\express\lib\router\index.js:174:3)的下一次测试中C:\Users\RadheKrishna\Desktop\RPROJECT\Rproject\node_modules\express\lib\router\index.js:284:7 at (C:\Users\RadheKrishna\Desktop\RPROJECT\Rproject\node_modules\express\lib\router\index.js:335:12) at as handle_request at trim_prefix Function.process_params at next (C:\Users\RadheKrishna\Desktop\RPROJECT\Rproject\node_modules\express\lib\router\index.js:275:10)