diff --git a/app/global/errcode/code.go b/app/global/errcode/code.go
index da4ddd1..64ba9a1 100644
--- a/app/global/errcode/code.go
+++ b/app/global/errcode/code.go
@@ -15,6 +15,6 @@ const (
 	ErrGeneralStart = ErrGeneral + iota
 	ErrInvalidData
 	ErrInternalError
-
 	ErrDataNoFound
+	ErrServerDown
 )
diff --git a/app/global/errcode/msg.go b/app/global/errcode/msg.go
index 6d70cb1..109979c 100644
--- a/app/global/errcode/msg.go
+++ b/app/global/errcode/msg.go
@@ -19,6 +19,7 @@ func init() {
 
 	// INGO
 	ErrMsgForUser = make(msg)
+	GeneralMsgUserInit(ErrMsgForUser)
 	AnimalMsgUserInit(ErrMsgForUser)
 	EncounterMsgUserInit(ErrMsgForUser)
 	KnowledgeMsgUserInit(ErrMsgForUser)
@@ -31,3 +32,7 @@ func GeneralMsgInit(m msg) {
 	m[ErrInternalError] = "内部服务器错误"
 	m[ErrDataNoFound] = "无数据查询"
 }
+
+func GeneralMsgUserInit(m msg) {
+	m[ErrServerDown] = "后端服务未启动，此功能暂时无法使用。"
+}
diff --git a/app/global/errcode/nlp.go b/app/global/errcode/nlp.go
index 4005075..98f47ca 100644
--- a/app/global/errcode/nlp.go
+++ b/app/global/errcode/nlp.go
@@ -12,5 +12,5 @@ func NlpMsgInit(m msg) {
 
 func NlpMsgUserInit(m msg) {
 	m[ErrNoContent] = "请输入内容"
-	m[ErrNoDocFound] = "没有找到相关文档"
+	m[ErrNoDocFound] = "小护没有在知识库中找到相关文档。😿😿😿"
 }
diff --git a/app/http/controller/web/rag_controller.go b/app/http/controller/web/rag_controller.go
index 34e85ac..06fc83d 100644
--- a/app/http/controller/web/rag_controller.go
+++ b/app/http/controller/web/rag_controller.go
@@ -6,6 +6,7 @@ import (
 	"catface/app/model_es"
 	"catface/app/service/nlp"
 	"catface/app/utils/response"
+	"fmt"
 	"io"
 	"net/http"
 
@@ -117,8 +118,11 @@ func (r *Rag) ChatWebSocket(context *gin.Context) {
 	// 1. query embedding
 	embedding, ok := nlp.GetEmbedding(query)
 	if !ok {
-		code := errcode.ErrPythonService
-		response.Fail(context, code, errcode.ErrMsg[code], "")
+		code := errcode.ErrServerDown
+		err := ws.WriteMessage(websocket.TextMessage, []byte(fmt.Sprintf("%d:%s", code, errcode.ErrMsgForUser[code])))
+		if err != nil {
+			variable.ZapLog.Error("Failed to send error message via WebSocket", zap.Error(err))
+		}
 		return
 	}
 
@@ -128,7 +132,11 @@ func (r *Rag) ChatWebSocket(context *gin.Context) {
 		variable.ZapLog.Error("ES TopK error", zap.Error(err))
 
 		code := errcode.ErrNoDocFound
-		response.Fail(context, code, errcode.ErrMsg[code], errcode.ErrMsgForUser[code])
+		err := ws.WriteMessage(websocket.TextMessage, []byte(fmt.Sprintf("%d:%s", code, errcode.ErrMsgForUser[code])))
+		if err != nil {
+			variable.ZapLog.Error("Failed to send error message via WebSocket", zap.Error(err))
+		}
+		return
 	}
 
 	// 3.