[feat] fix delete tombstone data bug
diff --git a/syncer/job/tombstone/tombstone.go b/syncer/job/tombstone/tombstone.go
index ec36073..d1023a9 100644
--- a/syncer/job/tombstone/tombstone.go
+++ b/syncer/job/tombstone/tombstone.go
@@ -34,7 +34,7 @@
 )
 
 func init() {
-	cronStr := config.GetString("sync.tombstone.retire,cron", "")
+	cronStr := config.GetString("sync.tombstone.retire.cron", "")
 	if len(cronStr) <= 0 {
 		cronStr = defaultDeleteExpireTombstoneCron
 	}