diff --git a/public/js/script.js b/public/js/script.js
index a296bc8e..fd527de4 100644
--- a/public/js/script.js
+++ b/public/js/script.js
@@ -284,7 +284,11 @@ function performLfmRequest(url, parameter, type) {
 }
 
 function displayErrorResponse(jqXHR) {
-  notify('<div style="max-height:50vh;overflow: scroll;">' + jqXHR.responseText + '</div>');
+  var message = JSON.parse(jqXHR.responseText)
+  if (Array.isArray(message)) {
+    message = message.join('<br>')
+  }
+  notify('<div style="max-height:50vh;overflow: auto;">' + message + '</div>');
 }
 
 var refreshFoldersAndItems = function (data) {
@@ -540,7 +544,7 @@ function rename(item) {
 }
 
 function trash(items) {
-  notify(lang['message-delete'], function () {
+  confirm(lang['message-delete'], function () {
     performLfmRequest('delete', {
       items: items.map(function (item) { return item.name; })
     }).done(refreshFoldersAndItems)
@@ -794,12 +798,16 @@ function notImp() {
   notify('Not yet implemented!');
 }
 
-function notify(body, callback) {
-  $('#notify').find('.btn-primary').toggle(callback !== undefined);
-  $('#notify').find('.btn-primary').unbind().click(callback);
+function notify(body) {
   $('#notify').modal('show').find('.modal-body').html(body);
 }
 
+function confirm(body, callback) {
+  $('#confirm').find('.btn-primary').toggle(callback !== undefined);
+  $('#confirm').find('.btn-primary').click(callback);
+  $('#confirm').modal('show').find('.modal-body').html(body);
+}
+
 function dialog(title, value, callback) {
   $('#dialog').find('input').val(value);
   $('#dialog').on('shown.bs.modal', function () {
diff --git a/src/Controllers/DeleteController.php b/src/Controllers/DeleteController.php
index 502d5695..ad0e4882 100644
--- a/src/Controllers/DeleteController.php
+++ b/src/Controllers/DeleteController.php
@@ -71,7 +71,7 @@ public function getDelete()
         }
 
         if (count($errors) > 0) {
-            return $errors;
+            return response()->json($errors, 400);
         }
 
         return parent::$success_response;
diff --git a/src/Controllers/LfmController.php b/src/Controllers/LfmController.php
index 991c7ad6..58d66e67 100644
--- a/src/Controllers/LfmController.php
+++ b/src/Controllers/LfmController.php
@@ -76,7 +76,7 @@ public function getErrors()
      *
      * @return null
      */
-    public function applyIniOverrides()
+    private function applyIniOverrides()
     {
         $overrides = config('lfm.php_ini_overrides', []);
 
@@ -90,4 +90,10 @@ public function applyIniOverrides()
             }
         }
     }
+
+    // TODO: remove this after refactoring RenameController and DeleteController
+    protected function error($error_type, $variables = [])
+    {
+        return trans(Lfm::PACKAGE_NAME . '::lfm.error-' . $error_type, $variables);
+    }
 }
diff --git a/src/Controllers/RenameController.php b/src/Controllers/RenameController.php
index d8187d58..8bcf593c 100644
--- a/src/Controllers/RenameController.php
+++ b/src/Controllers/RenameController.php
@@ -29,18 +29,18 @@ public function getRename()
 
         if (empty($new_name)) {
             if ($is_directory) {
-                return parent::error('folder-name');
+                return response()->json(parent::error('folder-name'), 400);
             } else {
-                return parent::error('file-name');
+                return response()->json(parent::error('file-name'), 400);
             }
         }
 
         if ($is_directory && config('lfm.alphanumeric_directory') && preg_match('/[^\w-]/i', $new_name)) {
-            return parent::error('folder-alnum');
+            return response()->json(parent::error('folder-alnum'), 400);
         } elseif (config('lfm.alphanumeric_filename') && preg_match('/[^.\w-]/i', $new_name)) {
-            return parent::error('file-alnum');
+            return response()->json(parent::error('file-alnum'), 400);
         } elseif ($this->lfm->setName($new_name)->exists()) {
-            return parent::error('rename');
+            return response()->json(parent::error('rename'), 400);
         }
 
         if (! $is_directory) {
diff --git a/src/views/index.blade.php b/src/views/index.blade.php
index fb5ec441..dbcb83b0 100644
--- a/src/views/index.blade.php
+++ b/src/views/index.blade.php
@@ -136,6 +136,17 @@
   </div>
 
   <div class="modal fade" id="notify" tabindex="-1" role="dialog" aria-hidden="true">
+    <div class="modal-dialog modal-lg">
+      <div class="modal-content">
+        <div class="modal-body"></div>
+        <div class="modal-footer">
+          <button type="button" class="btn btn-secondary w-100" data-dismiss="modal">{{ trans('laravel-filemanager::lfm.btn-close') }}</button>
+        </div>
+      </div>
+    </div>
+  </div>
+
+  <div class="modal fade" id="confirm" tabindex="-1" role="dialog" aria-hidden="true">
     <div class="modal-dialog modal-lg">
       <div class="modal-content">
         <div class="modal-body"></div>