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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): 25.0.2
Operating system and version (eg, Ubuntu 20.04): Ubuntu 20.04
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.41
PHP version (eg, 7.4): 7.4.3
The issue you are facing:
Sorry guys, I’m new to nextcloud and after couple of changes, I broke my app. When I try to open a file, I get an error, as per checking this into Admin->Logging, it shows the error as mentioned in below. I am not able to open a multiple files from win client or web browser or android app as well. It shows below logs:-
Please help me to resolve this.
Is this the first time you’ve seen this error? (Y/N):Y
Steps to replicate it: I see this for multiple files not sure how to reproduce.
The output of your Nextcloud log in Admin > Logging:
Sabre\DAV\Exception\ServiceUnavailable: Could not open file
/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/CorePlugin.php - line 85:
OCA\DAV\Connector\Sabre\File->get()
/var/www/nextcloud/3rdparty/sabre/event/lib/WildcardEmitterTrait.php - line 89:
Sabre\DAV\CorePlugin->httpGet()
/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 472:
Sabre\DAV\Server->emit()
/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 253:
Sabre\DAV\Server->invokeMethod()
/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 321:
Sabre\DAV\Server->start()
/var/www/nextcloud/apps/dav/lib/Server.php - line 360:
Sabre\DAV\Server->exec()
/var/www/nextcloud/apps/dav/appinfo/v2/remote.php - line 35:
OCA\DAV\Server->exec()
/var/www/nextcloud/remote.php - line 171:
require_once("/var/www/ne ... p")```
The output of your config.php file in `/path/to/nextcloud` (make sure you remove any identifiable information!):
{
“instanceid”: “REMOVED SENSITIVE VALUE”,
“passwordsalt”: “REMOVED SENSITIVE VALUE”,
“secret”: “REMOVED SENSITIVE VALUE”,
“trusted_domains”: [
“10.0.0.112” ],
“datadirectory”: “REMOVED SENSITIVE VALUE”,
“dbtype”: “mysql”,
“version”: “25.0.2.3”,
“overwrite.cli.url”: “http://10.0.0.112”,
“dbname”: “REMOVED SENSITIVE VALUE”,
“dbhost”: “REMOVED SENSITIVE VALUE”,
“dbport”: “”,
“dbtableprefix”: “oc_”,
“mysql.utf8mb4”: true,
“dbuser”: “REMOVED SENSITIVE VALUE”,
“dbpassword”: “REMOVED SENSITIVE VALUE”,
“installed”: true,
“default_locale”: “en_US”,
“default_phone_region”: “US”,
“logtimezone”: “America/New_York”,
“log_rotate_size”: 52428800,
“htaccess.RewriteBase”: “/”,
“twofactor_enforced”: “true”,
“twofactor_enforced_groups”: ,
“twofactor_enforced_excluded_groups”: ,
“memcache.local”: “\OC\Memcache\Redis”,
“memcache.locking”: “\OC\Memcache\Redis”,
“filelocking.enabled”: true,
“redis”: {
“host”: “REMOVED SENSITIVE VALUE”,
“port”: 0,
“timeout”: 0
}
}```
The output of your Apache/nginx/system log in /var/log/____:
PASTE HERE
PASTE HERE
Output errors in nextcloud.log in /var/www/ or as admin user in top right menu, filtering for errors. Use a pastebin service if necessary.
file","Code":0,"Trace":[{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/CorePlugin.php","line":85,"function":"get","class":"OCA\\DAV\\Connector\\Sabre\\File","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/event/lib/WildcardEmitterTrait.php","line":89,"function":"httpGet","class":"Sabre\\DAV\\CorePlugin","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":472,"function":"emit","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":253,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":321,"function":"start","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/apps/dav/lib/Server.php","line":360,"function":"exec","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/apps/dav/appinfo/v2/remote.php","line":35,"function":"exec","class":"OCA\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/remote.php","line":171,"args":["/var/www/nextcloud/apps/dav/appinfo/v2/remote.php"],"function":"require_once"}],"File":"/var/www/nextcloud/apps/dav/lib/Connector/Sabre/File.php","Line":495,"message":"Could not open file","exception":{},"CustomMessage":"Could not open file"}}