diff --git a/src/YunDa.Application/YunDa.ISAS.Application/GeneralInformation/ProtectionDevice/BoardCardDevice/BoardCardInfoAppService.cs b/src/YunDa.Application/YunDa.ISAS.Application/GeneralInformation/ProtectionDevice/BoardCardDevice/BoardCardInfoAppService.cs
index c666256..c4f3f2f 100644
--- a/src/YunDa.Application/YunDa.ISAS.Application/GeneralInformation/ProtectionDevice/BoardCardDevice/BoardCardInfoAppService.cs
+++ b/src/YunDa.Application/YunDa.ISAS.Application/GeneralInformation/ProtectionDevice/BoardCardDevice/BoardCardInfoAppService.cs
@@ -539,7 +539,7 @@ namespace YunDa.ISAS.Application.GeneralInformation
         [HttpGet]
         public RequestResult<List<BoardCardSolftVersionOutput>> FindHistorySoftVersionByEquipmentInfoId(Guid? equipmentInfoId)
         {
-            RequestResult<List<BoardCardSolftVersionOutput>> rst = ();
+            RequestResult<List<BoardCardSolftVersionOutput>> rst = new();
             try
             {
                 List<BoardCardSolftVersionOutput> historys = new List<BoardCardSolftVersionOutput>();