UNSOLVED CalDav calendar will not appear as a calendar
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On Nextcloud I have a caldav calendar. On my android device it syncs just fine.
In "settings" on my UBPorts tablet I have added the Nextcloud caldav account, and turned on the "linkage" to the UBPorts calendar application. When I tap on the sync icon in the calendar application I see the little popup that says that the sync completed. But, the Nextcloud caldav calendar never appears as a calendar to select in the UBPorts calendar application.
In case this helps, I see this in the sync-monitor.log file, don't know what is meant by the message below that says, "Account with empty sources!: 0":
[10/21/21 11:41 PM] syn requested for account: "nextcloud...." ()
[10/21/21 11:41 PM] Pushed into queue with immediately sync? true Sync is runnin
g false
[10/21/21 11:41 PM] Request sync
[10/21/21 11:41 PM] Wake lock aready created for sync-monitor
[10/21/21 11:41 PM] Sync requested: "nextcloud...." ()
[10/21/21 11:41 PM] Configure account: "nextcloud...." [ () ]
[10/21/21 11:41 PM] Authenticated !!!
[10/21/21 11:41 PM] Fetching remote calendars…)
[10/21/21 11:41 PM] Account with empty sources!: 0
[10/21/21 11:41 PM] Failed to configure account "nextcloud...." 0
[10/21/21 11:41 PM] Account sync error "nextcloud...." "generic-caldav" "0"
[10/21/21 11:41 PM] Sync error "nextcloud...." "generic-caldav" "0"
[10/21/21 11:41 PM] No more job to sync.
[10/21/21 11:45 PM] Network is offline