In kartik/gridview of yii2 export link is not display its shows the #? -

i have written following code export data csv or other format using kartik/gridview plugin in yii2. when click on export button display # sign on each type of export hot fix issue.

index.php

    <?php     use yii\helpers\html;     use yii\grid\gridview;     use yii\widgets\pjax;     use app\models\adminusermaster;     use yii\helpers\url;     use app\models\subadminroles;     use kartik\export\exportmenu;  /* code design coloumns */                         $gridcolumns = [                             ['class' => 'yii\grid\serialcolumn'],                             'full_name',                             'email',                             ['class' => 'yii\grid\actioncolumn'],                         ];  /* code create export menu */     echo exportmenu::widget([         'dataprovider' => $dataprovider,         'columns' => $gridcolumns,          'target' => exportmenu::target_blank,         'fontawesome' => true,         'dropdownoptions' => [             'label' => 'export all',             'class' => 'btn btn-default'         ]]);  /* code create gridview column , data action , number column */     echo \kartik\grid\gridview::widget([         'dataprovider' => $dataprovider,         'filtermodel' => $searchmodel,          'responsive' => true,             'hover' => true,             'bordered' => false,             'floatheader' => true,                     'pjax' => true,         'columns' => $gridcolumns,]);      ?> /* code configured gridview module */     

web.php file

    'modules' => [                                 'gridview' => [                     'class' => '\kartik\grid\module',                     //'downloadaction' => 'export',                     'downloadaction' => 'gridview/export/download',                     ]      please me how fix issue. 

you need create export options csv this.

gridview::widget([         'id' => 'kv-grid-vehicle',         'dataprovider'=>$dataprovider,         'filtermodel'=>$searchmodel,         'columns'=>$gridcolumns,         'resizablecolumns'=>true,         'containeroptions'=>['style'=>'overflow: auto'], // set when $responsive = false         'headerrowoptions'=>['class'=>'kartik-sheet-style'],         'filterrowoptions'=>['class'=>'kartik-sheet-style'],         'pjax'=>true, // pjax set true demo         'export'=>[             'fontawesome'=>true         ],         // parameters demo form         'bordered'=>true,         'striped'=>false,         'condensed'=>true,         'responsive'=>false,         'hover'=>true,         'showpagesummary'=>false,         'panel'=>[             'type'=>gridview::type_primary,                     ],         'persistresize'=>false,         'exportconfig'=>$defaultexportconfig,     ]);     ?> 

and $defaultexportconfig this

$defaultexportconfig = [         gridview::csv => [         'label' => yii::t('kvgrid', 'csv'),         'icon' => $isfa ? 'file-code-o' : 'floppy-open',          'iconoptions' => ['class' => 'text-primary'],         'showheader' => true,         'showpagesummary' => true,         'showfooter' => true,         'showcaption' => true,         'filename' => yii::t('kvgrid', 'grid-export'),         'alertmsg' => yii::t('kvgrid', 'the csv export file generated download.'),         'options' => ['title' => yii::t('kvgrid', 'comma separated values')],         'mime' => 'application/csv',         'config' => [             'coldelimiter' => ",",             'rowdelimiter' => "\r\n",         ]     ], ] 

may you.