diff --git a/controller.go b/controller.go
index 225f7fa609..14dea4d515 100644
--- a/controller.go
+++ b/controller.go
@@ -49,6 +49,7 @@ import (
 	"net"
 	"path/filepath"
 	"runtime"
+	"runtime/debug"
 	"strings"
 	"sync"
 	"time"
@@ -1052,7 +1053,8 @@ func (c *controller) NewSandbox(containerID string, options ...SandboxOption) (S
 	if containerID == "" {
 		return nil, types.BadRequestErrorf("invalid container ID")
 	}
-
+	logrus.Debugf("SAANVIIIIII  %s", containerID)
+	debug.PrintStack()
 	var sb *sandbox
 	c.Lock()
 	for _, s := range c.sandboxes {
diff --git a/error.go b/error.go
index 5f00709ff9..7d6b6c925a 100644
--- a/error.go
+++ b/error.go
@@ -107,6 +107,16 @@ func (nnr NetworkNameError) Error() string {
 // Forbidden denotes the type of this error
 func (nnr NetworkNameError) Forbidden() {}
 
+// PredefinedNetworkError is returned when user tries to create predefined network that already exists.
+type PredefinedNetworkError string
+
+func (pnr PredefinedNetworkError) Error() string {
+	return fmt.Sprintf("operation is not permitted on predefined %s network ", string(pnr))
+}
+
+// Forbidden denotes the type of this error
+func (pnr PredefinedNetworkError) Forbidden() {}
+
 // UnknownNetworkError is returned when libnetwork could not find in its database
 // a network with the same name and id.
 type UnknownNetworkError struct {
diff --git a/network.go b/network.go
index e283d65815..ae9dd3be11 100644
--- a/network.go
+++ b/network.go
@@ -2056,6 +2056,7 @@ func (c *controller) getConfigNetwork(name string) (*network, error) {
 }
 
 func (n *network) createLoadBalancerSandbox() error {
+	var err error
 	sandboxName := n.name + "-sbox"
 	sbOptions := []SandboxOption{}
 	if n.ingress {
@@ -2090,10 +2091,12 @@ func (n *network) createLoadBalancerSandbox() error {
 		}
 	}()
 
-	if err := ep.Join(sb, nil); err != nil {
+	err = ep.Join(sb, nil)
+	if err != nil {
 		return err
 	}
-	return sb.EnableService()
+	err = sb.EnableService()
+	return err
 }
 
 func (n *network) deleteLoadBalancerSandbox() {