Currently, errors for Tigris handler are checked by

if status.Code(err) == codes.NotFound {
	return nil, common.NewErrorMsg(common.ErrNamespaceNotFound, "ns not found")
}

Which causes such imports:

"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"

Let's check if we can use TigrisError from the client library here. The import path looks a bit confusing, but it's a client library indeed.