op-node,op-program: update network flag error format

op-node/chaincfg/chains.go

@@ -70,7 +70,7 @@ func ChainByName(name string) *superchain.ChainConfig {
 func GetRollupConfig(name string) (*rollup.Config, error) {
 	chainCfg := ChainByName(name)
 	if chainCfg == nil {
-		return nil, fmt.Errorf("invalid network %s", name)
+		return nil, fmt.Errorf("invalid network: %q", name)
 	}
 	rollupCfg, err := rollup.LoadOPStackRollupConfig(chainCfg.ChainID)
 	if err != nil {

op-program/host/cmd/main_test.go

@@ -75,7 +75,7 @@ func TestDefaultCLIOptionsMatchDefaultConfig(t *testing.T) {
 
 func TestNetwork(t *testing.T) {
 	t.Run("Unknown", func(t *testing.T) {
-		verifyArgsInvalid(t, "unavailable network: \"bar\"", replaceRequiredArg("--network", "bar"))
+		verifyArgsInvalid(t, "invalid network: \"bar\"", replaceRequiredArg("--network", "bar"))
 	})
 
 	t.Run("Required", func(t *testing.T) {