diff --git a/public/errors.py b/public/errors.py
index 77ad0db..eb003f1 100755
--- a/public/errors.py
+++ b/public/errors.py
@@ -81,6 +81,10 @@
     """To catch device boot errors."""
 
 
+class NoSubnetwork(DriverError):
+    """When there is no subnetwork for the GCE."""
+
+
 class DeviceBootTimeoutError(DeviceBootError):
     """Raised when an AVD defice failed to boot within timeout."""