fix issue with file naming
diff --git a/xos/services/vpn/admin.py b/xos/services/vpn/admin.py
index 67943b8..2c6250a 100644
--- a/xos/services/vpn/admin.py
+++ b/xos/services/vpn/admin.py
@@ -94,7 +94,7 @@
             self.fields['client_address'].initial = "10.8.0.2"
             self.fields['is_persistent'].initial = True
             self.fields['can_view_subnet'].initial = False
-            self.fields['file_name'].initial = "/static/vpn/" + time.time() + ".vpn"
+            self.fields['file_name'].initial = "/static/vpn/" + str(time.time()) + ".vpn"
             if VPNService.get_service_objects().exists():
                 self.fields["provider_service"].initial = VPNService.get_service_objects().all()[
                     0]