Unable to synch a file that does not exist

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Nextcloud version (eg, 20.0.5): 19.0.12 -
Operating system and version (eg, Ubuntu 20.04): Linux 4.9.159-vs2.3.9.8-vs+ #4 SMP Wed Aug 28 15:05:40 PDT 2019 x86_64
Apache or nginx version (eg, Apache 2.4.25): Apache (cgi-fcgi) (This is what the Nextcloud system report gives me.)
PHP version (eg, 7.4): 7.4.12

The issue you are facing:

For weeks, Nextcloud is telling me it can’t synch a file. The file does not exist. The error keeps popping up. See screenshot.


When pressing “Show details”, nothing happens. When I check the log, there is nothing about this issue.

Is this the first time you’ve seen this error? (Y/N): N

Steps to replicate it:

I can not replicate it. It’s just this one file about which Nextcloud complains. I removed the file, yet the complaints keep coming.

The output of your Nextcloud log in Admin > Logging:

I do not understand where I am to look for this. I do not see an ‘Admin’ menu option anywhere, nor do I see an ‘Admin’ folder on the server.

I cleaned the file /nextcloud/data/nextcloud.log at the start of the day and, after getting the notification I mention a number of times again, this log is literally completely empty.

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

I do not have a config.php file in this location. I do have it in /nextcloud/config/config.php.

What is considered not identifiable, in this file? I’ve removed most values.

$CONFIG = array (
  'instanceid' => '',
  'passwordsalt' => '',
  'secret' => '',
  'trusted_domains' => 
  array (
	0 => '',
  'datadirectory' => '',
  'overwrite.cli.url' => '',
  'dbtype' => 'mysql',
  'version' => '',
  'dbname' => '',
  'dbhost' => '',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'dbuser' => '',
  'dbpassword' => '',
  'installed' => true,
  'maintenance' => false,
  'theme' => '',
  'loglevel' => 2,
  'mail_smtpmode' => 'sendmail',
  'mail_from_address' => '',
  'mail_domain' => '',
  'mail_smtpauthtype' => 'PLAIN',
  'mail_smtphost' => '',
  'mail_smtpport' => '465',
  'mail_smtpsecure' => 'ssl',

The output of your Apache/nginx/system log in /var/log/____:

I don’t appear to have permission to download this file.