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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): 22.1.0
Operating system and version (eg, Ubuntu 20.04): 20.04
Apache or nginx version (eg, Apache 2.4.25): 2.4.41
PHP version (eg, 7.4): 7.4
The issue you are facing:
I cant add users nor circles under the Deck app.
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- Go to Deck
- Load Board
- Go to the Board’s sharing/option
- The search bar has a looping circle like searching but whatever i type (user,group or circle it doesnt show up.
The output of your Nextcloud log in Admin > Logging:
[no app in context] Error: in_array() expects parameter 2 to be array, null given
GET /ocs/v2.php/apps/files_sharing/api/v1/sharees?search=&format=json&perPage=20&itemType=0%2C1%2C4%2C7&lookup=false
from <IP> by monark at 2021-08-20T03:05:59+00:00
{"reqId":"1hFJC1ZsTZuPxXjkNIu4","level":3,"time":"2021-08-20T03:05:59+00:00","remoteAddr":"<IP>","user":"monark","app":"no app in context","method":"GET","url":"/ocs/v2.php/apps/files_sharing/api/v1/sharees?search=&format=json&perPage=20&itemType=0%2C1%2C4%2C7&lookup=false","message":"in_array() expects parameter 2 to be array, null given","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.131 Safari/537.36 Edg/92.0.902.73","version":"22.1.0.1","exception":{"Exception":"Exception","Message":"in_array() expects parameter 2 to be array, null given","Code":0,"Trace":[{"file":"/var/www/cloud.monrk.mx/lib/private/AppFramework/App.php","line":156,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/cloud.monrk.mx/lib/private/Route/Router.php","line":301,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/var/www/cloud.monrk.mx/ocs/v1.php","line":62,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/cloud.monrk.mx/ocs/v2.php","line":23,"args":["/var/www/cloud.monrk.mx/ocs/v1.php"],"function":"require_once"}],"File":"/var/www/cloud.monrk.mx/lib/private/AppFramework/Http/Dispatcher.php","Line":158,"Previous":{"Exception":"TypeError","Message":"in_array() expects parameter 2 to be array, null given","Code":0,"Trace":[{"file":"/var/www/cloud.monrk.mx/apps/circles/lib/Collaboration/v2/CollaboratorSearchPlugin.php","line":101,"function":"in_array"},{"file":"/var/www/cloud.monrk.mx/lib/private/Collaboration/Collaborators/Search.php","line":72,"function":"search","class":"OCA\\Circles\\Collaboration\\v2\\CollaboratorSearchPlugin","type":"->"},{"file":"/var/www/cloud.monrk.mx/apps/files_sharing/lib/Controller/ShareesAPIController.php","line":228,"function":"search","class":"OC\\Collaboration\\Collaborators\\Search","type":"->"},{"file":"/var/www/cloud.monrk.mx/lib/private/AppFramework/Http/Dispatcher.php","line":217,"function":"search","class":"OCA\\Files_Sharing\\Controller\\ShareesAPIController","type":"->"},{"file":"/var/www/cloud.monrk.mx/lib/private/AppFramework/Http/Dispatcher.php","line":126,"function":"executeController","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/cloud.monrk.mx/lib/private/AppFramework/App.php","line":156,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/cloud.monrk.mx/lib/private/Route/Router.php","line":301,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/var/www/cloud.monrk.mx/ocs/v1.php","line":62,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/cloud.monrk.mx/ocs/v2.php","line":23,"args":["/var/www/cloud.monrk.mx/ocs/v1.php"],"function":"require_once"}],"File":"/var/www/cloud.monrk.mx/apps/circles/lib/Collaboration/v2/CollaboratorSearchPlugin.php","Line":101},"CustomMessage":"--"},"id":"611f1c6082cca"}
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