I had some issues updating Nextcloud so I tried uninstalling and reinstalling the app. However now it won’t download a fresh install either.
I’ve tried restarting the phone but it makes no difference.
Same for me on Free Phone 3.
Same for me on Samsung s7 edge (/e/Os store).
On my device the error seems to be fixed. The nextcloud app was updated again.
I have get this case, 2 weeks before.
yesterday, it’s work, any another action on my side.
I have get similar case for install new app (opsgenie) and after launch 2-3 install : it’s works
Hello.
While uninstalling an app its data’s folder may stays in Android > Data…
From Settings > Apps > xxx-app I wipe cache (sometimes data too) first, then uninstall, reboot phone and download updated app.
My two cents 
It’ work after reboot 