diff --git a/middleware/logger.go b/middleware/logger.go
index a78a427..281f310 100644
--- a/middleware/logger.go
+++ b/middleware/logger.go
@@ -2,6 +2,7 @@ package middleware
 
 import (
 	"context"
+	"git.diulo.com/mogfee/kit/core/logx"
 )
 
 func Logger(logger logx.Logger) Middleware {
diff --git a/selector/selector.go b/selector/selector.go
index d893a66..3ab0c95 100644
--- a/selector/selector.go
+++ b/selector/selector.go
@@ -2,9 +2,10 @@ package selector
 
 import (
 	"context"
+	"git.diulo.com/mogfee/kit/errors"
 )
 
-var ErrNoAvailable = errorx.ServiceUnavailable("no_available_node", "")
+var ErrNoAvailable = errors.ServiceUnavailable("no_available_node", "")
 
 type Selector interface {
 	Rebalancer