diff --git a/nextcloud_backup/rootfs/opt/nextcloud_backup/error_code.md b/nextcloud_backup/rootfs/opt/nextcloud_backup/error_code.md
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+# Error Codes
+
+- `1` => Fail to downlaod snap
+- `2` => Nextcloud config invalid
+- `3` => Can't connect to nextcloud
+- `4` => Upload snap fail
+- `5` => Fail create new snap
\ No newline at end of file