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

<div align="left"><figure><img src="/files/dsEtba4XNrs6zUuv1b5B" alt=""><figcaption></figcaption></figure></div>

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.