(服务器wamp中)lavavel 安装过版本5的时候，打开localhost：8000，可以成功，但是在再次打开的时候就会出错误，但是不知道怎么解决。附上图
Fatal error: Call to undefined function Illuminate\Foundation\Bootstrap\mb_internal_encoding() in D:\wamp\www\laravel\vendor\laravel\framework\src\Illuminate\Foundation\Bootstrap\LoadConfiguration.php on line 43
Call Stack
2 2.6712 2508872 Illuminate\Foundation\Http\Kernel->handle( ) ..\index.php:53
3 2.6712 2508984 Illuminate\Foundation\Http\Kernel->sendRequestThroughRouter( ) ..\Kernel.php:87
4 2.7486 2533224 Illuminate\Foundation\Http\Kernel->bootstrap( ) ..\Kernel.php:117
5 2.7486 2533312 Illuminate\Foundation\Application->bootstrapWith( ) ..\Kernel.php:222
6 2.9485 2603192 Illuminate\Foundation\Bootstrap\LoadConfiguration->bootstrap( ) ..\Application.php:203
Call Stack
Time Memory Function Location
1 0.0682 137296 {main}( ) ..\index.php:02 2.6712 2508872 Illuminate\Foundation\Http\Kernel->handle( ) ..\index.php:53
3 2.6712 2508984 Illuminate\Foundation\Http\Kernel->sendRequestThroughRouter( ) ..\Kernel.php:87
4 2.7486 2533224 Illuminate\Foundation\Http\Kernel->bootstrap( ) ..\Kernel.php:117
5 2.7486 2533312 Illuminate\Foundation\Application->bootstrapWith( ) ..\Kernel.php:222
6 2.9485 2603192 Illuminate\Foundation\Bootstrap\LoadConfiguration->bootstrap( ) ..\Application.php:203
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