diff --git a/examples/gno.land/p/demo/grc/grc721/errors.gno b/examples/gno.land/p/demo/grc/grc721/errors.gno
index 08fb26b0cb5..de5fba57054 100644
--- a/examples/gno.land/p/demo/grc/grc721/errors.gno
+++ b/examples/gno.land/p/demo/grc/grc721/errors.gno
@@ -13,5 +13,6 @@ var (
 	ErrTransferFromIncorrectOwner  = errors.New("transfer from incorrect owner")
 	ErrTransferToNonGRC721Receiver = errors.New("transfer to non GRC721Receiver implementer")
 	ErrCallerIsNotOwnerOrApproved  = errors.New("caller is not token owner or approved")
+	ErrTokenURINotSet			   = errors.New("tokeURIs not set")
 	ErrTokenIdAlreadyExists        = errors.New("token id already exists")
 )