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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): 27.0.2
Operating system and version (eg, Ubuntu 20.04): unknown
Apache or nginx version (eg, Apache 2.4.25): unknown
PHP version (eg, 7.4): unknown
PS : The server is hosted by a service provider and I don’t know all the details, nor do I have access to this server…
The issue you are facing:
With “Polls” (V 5.3.0) I can no longer create public links… I systematically get the following error: “Error adding a public link”.
The “Logging” application doesn’t indicate any error, I’ve cleared my browser’s cache. Note that I’ve just upgraded from Polls 5.2.0 to 5.3.0.
Is this the first time you’ve seen this error? (Y/N): Yes
Steps to replicate it:
- Create a new poll
- Put some informations
- Click on “Add a new public link”
The output of your Nextcloud log in Admin > Logging:
Nothing...
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
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.
PASTE HERE