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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Illuminate\Support\Facades\Schema;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Illuminate\Database\Schema\Blueprint;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Illuminate\Database\Migrations\Migration;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Class CreateSubmodulesTable.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class CreateSubmodulesTable extends Migration  | 
            
                            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Run the migrations.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return void  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function up()  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        Schema::create('submodules', function (Blueprint $table) { | 
            
                            
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                            $table->increments('id'); | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $table->string('name'); | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $table->unsignedTinyInteger('order')->nullable(); | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $table->integer('type')->unsigned()->default(1); | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $table->date('total_hours')->nullable(); | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $table->date('week_hours')->nullable(); | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $table->date('start_date')->nullable(); | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $table->date('end_date')->nullable(); | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $table->timestamps();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        });  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        Schema::create('module_submodule', function (Blueprint $table) { | 
            
                            
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                            $table->integer('module_id')->unsigned(); | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $table->integer('submodule_id')->unsigned(); | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $table->timestamps();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        });  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        Schema::create('classroom_submodule', function (Blueprint $table) { | 
            
                            
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                            $table->integer('classroom_id')->unsigned(); | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $table->integer('submodule_id')->unsigned(); | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $table->timestamps();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        });  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        Schema::create('course_submodule', function (Blueprint $table) { | 
            
                            
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                            $table->integer('course_id')->unsigned(); | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $table->integer('submodule_id')->unsigned(); | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $table->timestamps();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        });  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Reverse the migrations.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return void  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function down()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        Schema::dropIfExists('submodules'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        Schema::dropIfExists('module_submodule'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        Schema::dropIfExists('classroom_submodule'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        Schema::dropIfExists('course_submodule'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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You can fix this by adding a namespace to your class:
When choosing a vendor namespace, try to pick something that is not too generic to avoid conflicts with other libraries.