first upload all files

Modules/FlashSale/Routes/admin.php

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+<?php
+
+use Illuminate\Support\Facades\Route;
+
+Route::get('flash-sales', [
+    'as' => 'admin.flash_sales.index',
+    'uses' => 'FlashSaleController@index',
+    'middleware' => 'can:admin.flash_sales.index',
+]);
+
+Route::get('flash-sales/create', [
+    'as' => 'admin.flash_sales.create',
+    'uses' => 'FlashSaleController@create',
+    'middleware' => 'can:admin.flash_sales.create',
+]);
+
+Route::post('flash-sales', [
+    'as' => 'admin.flash_sales.store',
+    'uses' => 'FlashSaleController@store',
+    'middleware' => 'can:admin.flash_sales.create',
+]);
+
+Route::get('flash-sales/{id}/edit', [
+    'as' => 'admin.flash_sales.edit',
+    'uses' => 'FlashSaleController@edit',
+    'middleware' => 'can:admin.flash_sales.edit',
+]);
+
+Route::put('flash-sales/{id}', [
+    'as' => 'admin.flash_sales.update',
+    'uses' => 'FlashSaleController@update',
+    'middleware' => 'can:admin.flash_sales.edit',
+]);
+
+Route::delete('flash-sales/{ids?}', [
+    'as' => 'admin.flash_sales.destroy',
+    'uses' => 'FlashSaleController@destroy',
+    'middleware' => 'can:admin.flash_sales.destroy',
+]);