Hello !!
I am on /e/ os (Android 9) with microG.
I installed Nextcloud dev Android app (version 20200714).
I would like to sync my device with my server but I get this.
It’s strange because I have many files and folders on my server. Also the tabs Activities and Photos work on the Android app.
I tried on the stable Nextcloud channel but the problem persists.
Thank you for you help 
Now I can see the folders and the files but I can’t upload or create folder…
I have the same problem on IOS, I get error 500. I tried with other account, all work perfectly. 
So if both clients (iOS and Android) fail, but work with another account, it seems to be a server-related issue.
Therefore the logs of your nextcloud instance are necessary to analyze the problem. (make sure to remove sensitive data before posting it here!)
Hello @stefan-niedermann !
Thank you for you help !!
Ok, I will give you my log shortly. (I am not at home today).
But maybe I found the problem, I have a folder share from a federate server, but this server is temporally down. I get some errors when I want to rename or unshare it.
Maybe it’s blocking the sync ?
What do you think ?
Bye
But maybe I found the problem, I have a folder share from a federate server, but this server is temporally down. I get some errors when I want to rename or unshare it.
Sounds reasonable.
Though the app is supposed to skip this and sync the other stuff - or at least display an appropriate error message so one can handle the issue.
If this actually is the issue and you are able to reproduce it / recreate the circumstances where it is reproducible, you should open a bug report.
Yes, I’ll wait until the federated server is up and running again.
Thank you
Hello,
My logs, but nothing about error 500 or sync with my phone 
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{"reqId":"hmUGYvuZpqK15DPBnyGZ","level":4,"time":"2020-07-18T10:39:20+00:00","remoteAddr":"2.8.75.229","user":"nextcloud_user","app":"webdav","method":"DELETE","url":"/remote.php/dav/files/nextcloud_user/SITE%20(%20mieux%20que%20cloud%20)","message":{"Exception":"Sabre\\DAV\\Exception\\ServiceUnavailable","Message":"","Code":0,"Trace":[{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Tree.php","line":76,"function":"getChild","class":"OCA\\DAV\\Connector\\Sabre\\Directory","type":"->","args":["SITE ( data folder )"]},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Tree.php","line":178,"function":"getNodeForPath","class":"Sabre\\DAV\\Tree","type":"->","args":["files/nextcloud_user/SITE ( data folder )"]},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/CorePlugin.php","line":287,"function":"delete","class":"Sabre\\DAV\\Tree","type":"->","args":["files/nextcloud_user/SITE ( data folder )"]},{"function":"httpDelete","class":"Sabre\\DAV\\CorePlugin","type":"->","args":[{"absoluteUrl":"https://www.cloud.fr/remote.php/dav/files/nextcloud_user/SITE%20(%20mieux%20que%20cloud%20)","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]},{"file":"/var/www/nextcloud/3rdparty/sabre/event/lib/EventEmitterTrait.php","line":105,"function":"call_user_func_array","args":[[{"__class__":"Sabre\\DAV\\CorePlugin"},"httpDelete"],[{"absoluteUrl":"https://www.cloud.fr/remote.php/dav/files/nextcloud_user/SITE%20(%20mieux%20que%20cloud%20)","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]]},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":479,"function":"emit","class":"Sabre\\Event\\EventEmitter","type":"->","args":["method:DELETE",[{"absoluteUrl":"https://www.cloud.fr/remote.php/dav/files/nextcloud_user/SITE%20(%20mieux%20que%20cloud%20)","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]]},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":254,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->","args":[{"absoluteUrl":"https://www.cloud.fr/remote.php/dav/files/nextcloud_user/SITE%20(%20mieux%20que%20cloud%20)","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]},{"file":"/var/www/nextcloud/apps/dav/lib/Server.php","line":319,"function":"exec","class":"Sabre\\DAV\\Server","type":"->","args":[]},{"file":"/var/www/nextcloud/apps/dav/appinfo/v2/remote.php","line":35,"function":"exec","class":"OCA\\DAV\\Server","type":"->","args":[]},{"file":"/var/www/nextcloud/remote.php","line":165,"args":["/var/www/nextcloud/apps/dav/appinfo/v2/remote.php"],"function":"require_once"}],"File":"/var/www/nextcloud/apps/dav/lib/Connector/Sabre/Directory.php","Line":225,"CustomMessage":"--"},"userAgent":"Mozilla/5.0 (X11; Fedora; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.89 Safari/537.36","version":"18.0.7.1"}www/nextcloud/remote.php","line":165,"args":["/var/www/nextcloud/apps/dav/appinfo/v2/remote.php"],"function":"require_once"}],"File":"/var/www/nextcloud/apps/dav/lib/Connector/Sabre/QuotaPlugin.php","Line":174,"CustomMessage":"--"},"userAgent":"Mozilla/5.0 (Android) Nextcloud-android/3.12.1","version":"18.0.7.1"}
{"reqId":"2sn2PIbHaqz4Y0pC5ljc","level":2,"time":"2020-07-18T10:34:23+00:00","remoteAddr":"2.8.75.229","user":"admin","app":"l10n","method":"GET","url":"/settings/user","message":"Failed to load /var/www/nextcloud/apps/drop_account/l10n/en.json - json error code: 4","userAgent":"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.89 Safari/537.36","version":"18.0.7.1"}
++