In error, the first letter is low-case letter

cmd/hyperkube/hyperkube.go

@@ -149,7 +149,7 @@ func (hk *HyperKube) Run(args []string) error {
 			baseCommand = baseCommand + " " + serverName
 			args = args[1:]
 		} else {
-			err = errors.New("No server specified")
+			err = errors.New("no server specified")
 			hk.Printf("Error: %v\n\n", err)
 			hk.Usage()
 			return err

cmd/hyperkube/hyperkube_test.go

@@ -50,7 +50,7 @@ func testServerError(n string) *Server {
 		Long:        fmt.Sprintf("A simple server named %s that returns an error", n),
 		Run: func(s *Server, args []string) error {
 			s.hk.Printf("%s Run\n", s.Name())
-			return errors.New("Server returning error")
+			return errors.New("server returning error")
 		},
 	}
 }
@@ -142,7 +142,7 @@ func TestLinkRun(t *testing.T) {
 
 func TestTopNoArgs(t *testing.T) {
 	x := runFull(t, "hyperkube")
-	assert.EqualError(t, x.err, "No server specified")
+	assert.EqualError(t, x.err, "no server specified")
 }
 
 func TestBadServer(t *testing.T) {
@@ -192,7 +192,7 @@ func TestServerFlagsBad(t *testing.T) {
 func TestServerError(t *testing.T) {
 	x := runFull(t, "hyperkube test-error")
 	assert.Contains(t, x.output, "test-error Run")
-	assert.EqualError(t, x.err, "Server returning error")
+	assert.EqualError(t, x.err, "server returning error")
 }
 
 func TestCobraCommandHelp(t *testing.T) {

contrib/mesos/cmd/km/hyperkube.go

@@ -138,7 +138,7 @@ func (hk *HyperKube) Run(args []string) error {
 			baseCommand = baseCommand + " " + serverName
 			args = args[1:]
 		} else {
-			err = errors.New("No server specified")
+			err = errors.New("no server specified")
 			hk.Printf("Error: %v\n\n", err)
 			hk.Usage()
 			return err

contrib/mesos/cmd/km/hyperkube_test.go

@@ -48,7 +48,7 @@ func testServerError(n string) *Server {
 		Long:        fmt.Sprintf("A simple server named %s that returns an error", n),
 		Run: func(s *Server, args []string) error {
 			s.hk.Printf("%s Run\n", s.Name())
-			return errors.New("Server returning error")
+			return errors.New("server returning error")
 		},
 	}
 }
@@ -90,7 +90,7 @@ func TestLinkRun(t *testing.T) {
 
 func TestTopNoArgs(t *testing.T) {
 	x := runFull(t, "hyperkube")
-	assert.EqualError(t, x.err, "No server specified")
+	assert.EqualError(t, x.err, "no server specified")
 }
 
 func TestBadServer(t *testing.T) {
@@ -140,5 +140,5 @@ func TestServerFlagsBad(t *testing.T) {
 func TestServerError(t *testing.T) {
 	x := runFull(t, "hyperkube test-error")
 	assert.Contains(t, x.output, "test-error Run")
-	assert.EqualError(t, x.err, "Server returning error")
+	assert.EqualError(t, x.err, "server returning error")
 }