diff --git a/src/qibotn/backends/__init__.py b/src/qibotn/backends/__init__.py
index 4916565..48a1570 100644
--- a/src/qibotn/backends/__init__.py
+++ b/src/qibotn/backends/__init__.py
@@ -1,5 +1,7 @@
 from typing import Union
 
+from qibo.config import raise_error
+
 from qibotn.backends.cutensornet import CuTensorNet  # pylint: disable=E0401
 from qibotn.backends.quimb import QuimbBackend  # pylint: disable=E0401