活动行事历导入错误返回4

app/Http/Controllers/Admin/EventCalendarController.php

@@ -384,7 +384,7 @@ class EventCalendarController extends BaseController
 
             // 6. 返回错误行
             if ($error_arr) {
-                throw new CustomException(implode("\\n", $error_arr));
+                throw new CustomException(implode("<br>", $error_arr));
             }
             return $this->responseService->success(
                 __('controller.import.success')