Hi @Anshu kumar
I get the same error on my account, using the latest Enpass 6 Beta on iOS 12.
I can see, that the file /Enpass6-Beta/vault.enpassdbsync is downloaded by the iPhone in my WebDAV log, but nothing happens inside the app.
I'm using the built-in WebDAV Server on my Synology NAS - only available in my LAN
Everything is working fine with Enpass 5 btw.