Try uninstalling and reinstalling your Bitdefender product.
If the issue persists, kindly have a look at the link below
https://www.bitdefender.com/consumer/support/answer/11311/
Even if the issue is still not rectified, kindly contact Bitdefender support by visiting https://www.bitdefender.com/consumer/support/help
Select, How to's & Troubleshooting Bitdefender products→Troubleshooting→I don't know→Contact Support→ You will get the option of chat, call or email.
Regards