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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 20.0.5): latest
Operating system and version (eg, Ubuntu 20.04): Unraid 6.9.2
Apache or nginx version (eg, Apache 2.4.25): how do I check?
PHP version (eg, 7.4): how do I check?
The issue you are facing:
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- I am on most recent version of Windows 10. When I start up the machine, Nextcloud “starts” but then closes. In the task bar it disappears. I try to open it and it shows in the task bar for a few seconds, then it disappears. I have uninstalled Nextcloud, restarted my machine, and reinstalled. Same problem
The output of your Nextcloud log in Admin > Logging:
Can't find the logs because I can't open the app
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
PASTE HERE
The output of your Apache/nginx/system log in /var/log/____:
PASTE HERE
This is in my error.log
[26-Sep-2021 02:00:02] NOTICE: fpm is running, pid 797
[26-Sep-2021 02:00:02] NOTICE: ready to handle connections
[26-Sep-2021 13:03:54] WARNING: [pool www] server reached pm.max_children setting (5), consider raising it
[26-Sep-2021 13:23:27] WARNING: [pool www] server reached pm.max_children setting (5), consider raising it
[27-Sep-2021 01:00:34] NOTICE: Terminating …
[27-Sep-2021 01:00:34] NOTICE: exiting, bye-bye!
[27-Sep-2021 01:01:52] NOTICE: fpm is running, pid 395
[27-Sep-2021 01:01:52] NOTICE: ready to handle connections
[27-Sep-2021 03:00:08] NOTICE: Terminating …
[27-Sep-2021 03:00:08] NOTICE: exiting, bye-bye!
[27-Sep-2021 03:10:44] NOTICE: fpm is running, pid 393
[27-Sep-2021 03:10:44] NOTICE: ready to handle connections
[27-Sep-2021 23:58:48] WARNING: [pool www] server reached pm.max_children setting (5), consider raising it
[28-Sep-2021 00:00:16] WARNING: [pool www] server reached pm.max_children setting (5), consider raising it
[28-Sep-2021 00:03:12] WARNING: [pool www] server reached pm.max_children setting (5), consider raising it
[28-Sep-2021 00:47:47] WARNING: [pool www] server reached pm.max_children setting (5), consider raising it
[28-Sep-2021 00:51:28] WARNING: [pool www] server reached pm.max_children setting (5), consider raising it
[28-Sep-2021 00:53:13] WARNING: [pool www] server reached pm.max_children setting (5), consider raising it
[28-Sep-2021 01:19:36] WARNING: [pool www] server reached pm.max_children setting (5), consider raising it
[28-Sep-2021 01:22:46] WARNING: [pool www] server reached pm.max_children setting (5), consider raising it
[28-Sep-2021 01:26:26] WARNING: [pool www] server reached pm.max_children setting (5), consider raising it
[28-Sep-2021 01:34:13] WARNING: [pool www] server reached pm.max_children setting (5), consider raising it
[28-Sep-2021 01:48:12] WARNING: [pool www] server reached pm.max_children setting (5), consider raising it
[28-Sep-2021 02:06:06] WARNING: [pool www] server reached pm.max_children setting (5), consider raising it
[28-Sep-2021 02:22:34] WARNING: [pool www] server reached pm.max_children setting (5), consider raising it
[28-Sep-2021 02:24:29] WARNING: [pool www] server reached pm.max_children setting (5), consider raising it
[28-Sep-2021 02:27:05] WARNING: [pool www] server reached pm.max_children setting (5), consider raising it
[28-Sep-2021 17:43:40] WARNING: [pool www] server reached pm.max_children setting (5), consider raising it
[28-Sep-2021 17:45:28] WARNING: [pool www] server reached pm.max_children setting (5), consider raising it
[28-Sep-2021 17:58:39] WARNING: [pool www] server reached pm.max_children setting (5), consider raising it
[28-Sep-2021 18:19:38] WARNING: [pool www] server reached pm.max_children setting (5), consider raising it
[01-Oct-2021 01:00:17] NOTICE: Terminating …
[01-Oct-2021 01:00:17] NOTICE: exiting, bye-bye!
[01-Oct-2021 01:01:33] NOTICE: fpm is running, pid 397
[01-Oct-2021 01:01:33] NOTICE: ready to handle connections
[01-Oct-2021 09:47:31] WARNING: [pool www] server reached pm.max_children setting (5), consider raising it