From 8fa6e2b103e436435ad0f0ae00e8cc9af4c58ad4 Mon Sep 17 00:00:00 2001
From: Victor Vieux <victor@docker.com>
Date: Wed, 30 Oct 2013 11:24:50 -0700
Subject: [PATCH] improve error message

---
 runtime.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/runtime.go b/runtime.go
index 097a74a1f4..0834dd668a 100644
--- a/runtime.go
+++ b/runtime.go
@@ -355,6 +355,9 @@ func (runtime *Runtime) Create(config *Config, name string) (*Container, []strin
 
 	// Set the enitity in the graph using the default name specified
 	if _, err := runtime.containerGraph.Set(name, id); err != nil {
+		if strings.HasSuffix(err.Error(), "name are not unique") {
+			return nil, nil, fmt.Errorf("Conflict, %s already exists.", name)
+		}
 		return nil, nil, err
 	}