fix some more compile issues

cmd/server/main.go

@@ -85,6 +85,7 @@ type Options struct {
 	logPath       string `json:"log_file,omitempty"`
 	hush3ConfPath string `json:"hush3_conf,omitempty"`
 	cacheSize     int    `json:"hush3_conf,omitempty"`
+    PingEnable    bool
 }
 
 func main() {
@@ -215,15 +216,16 @@ func main() {
 	{
 		service, err := frontend.NewLwdStreamer(cache, chainName, opts.PingEnable)
 		if err != nil {
-			common.Log.WithFields(logrus.Fields{
+			log.WithFields(logrus.Fields{
 				"error": err,
 			}).Fatal("couldn't create backend")
 		}
 		walletrpc.RegisterCompactTxStreamerServer(server, service)
+
+	    // Register service
+	    walletrpc.RegisterCompactTxStreamerServer(server, service)
 	}
 
-	// Register service
-	walletrpc.RegisterCompactTxStreamerServer(server, service)
 
 
     // Initialize mempool monitor