# Launching D5 from the D5 converter gives the error "default error".

![image](https://docs-static.d5render.com/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces/-MjbN1iGmN_HBnj_fyU9/uploads/fvvS2IRUYhWv1HDahLJe/image.png)

When the D5 client detects an abnormality in the network connection of the current device, it will prompt "default error".

Solution: Disable the firewall and the VPN, then sync again.