"Class App\Http\Controllers\UserController does not exist"

I am a beginner to PHP and laravel I am having this error

This is user controller

<?php

namespace App\Http\Controllers;

use App\User;
use Illuminate\Http\Request;


class UserController extends Controller
{
    public function postSignUp(Request $request)
    {
        $fullname = $request['fullname'];
        $email    = $request['email'];
        $password = bcrypt($request['password']);
    
        $user = new User();
        $user->fullname = $fullname;
        $user->email    = $email;
        $user->password  = $password;

        $user->save();

        return redirect()->back();

    }
    public function postSignIn()
    {

    }

}
?>

Migration table

<?php

use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreateUsersTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('users', function (Blueprint $table) {
            $table->increments('id');
            $table->timestamps();
            $table->string('fullname');
            $table->string('email');
            $table->string('password');
            $table->rememberToken();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('users');
    }
}
?>

<?php
@extends('layout.master')

@section('title')
Home
@endsection

@section('content')
<div class="row style=padding-top: 10px;">
        <div class="col-lg-6 col-md-6 col-xs-12">
            <h3 class="text-center text-primary">Register</h3>
            <form action="{{URL('signup')}}" method="post">
                <div class="form-group">
                    <label for="name">Your Full Name</label>
                    <input class="form-control" type="text" name="fullname" id="name">
                </div>

                <div class="form-group">
                    <label for="email">Your Email</label>
                    <input class="form-control" type="email" name="email" id="email">
                </div>

                <div class="form-group">
                    <label for="password">Password</label>
                    <input class="form-control" type="password" name="pass" id="pass">
                </div>

                <div class="form-group">
                    <label for="repeat-pass">Repeat Password</label>
                    <input class="form-control" type="password" name="repeat-pass" id="repeat-pass">
                </div>

                <div class="form-group">
                        <input class="btn btn-primary" type="submit" name="pass" id="pass">
                    </div>
                <input type="hidden" name="_token" value="{{Session::token()}}"
            </form>
                
        </div>
        <div class="col-lg-6 col-md-6 col-xs-12">
            <h3 class="text-center text-danger">Login</h3>
            <form action="" method="post">
                    <div class="form-group">
                        <label for="email">Your Email</label>
                        <input class="form-control" type="email" name="email" id="email">
                    </div>
    
                    <div class="form-group">
                        <label for="password">Password</label>
                        <input class="form-control" type="password" name="pass" id="pass">
                    </div>
    
                    <div class="form-group">
                            <input class="btn btn-danger" type="submit" name="pass" id="pass">
                        </div>
                </form>
                    
    
            </div>

</div>
@endsection
?>

I hope someone can help me out Thanks