after installing tinker, laravel webapp shows error message

I am using laravel 5* framework. Everything had worked fine so far until I installed tinker vendor to the project. Now I have following error message:

Argument 1 passed to Laravel\Lumen\Http\Redirector::__construct() must be an instance of Laravel\Lumen\Application, instance of Illuminate\Foundation\Application given, called in C:\OpenServer\domains\localhost\Laradmin\vendor\laravel\lumen-framework\src\helpers.php on line 240 and defined

I am a new so do not have any idea about the error. How can I solve it? thanks

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