Drupal 8.x

Dear all,
Here's something I have been struggling with for months.
When I run 'Cron' via Configuration > Cron, this is what I get:

We had installed SSL certificates in my Drupal project in AWS server, the website works fine with https. In this site we had configured our custom wallee module which is using Drupal Wallee SDK for payment transaction related functions. But while trying to initiate a new payment transaction below SSL certificate problem is triggering.

error setting certificate verify locations: CAfile: /var/www/html/walle/vendor/wallee/sdk/lib/ca-bundle.crt CApath: none

THe site worked fine in ddev. I updated it via composer and it works just fine.

THen I exported db via CMD and zipped files and uploaded them via filemanager to fresh new folder on live server.

I also imported db in new site. I inserted new database and user in setting.php and tried to open the site. 

THe site does not want to open at all. Nothing helps.

When I flag the content it works.
When I unflag the content, I have an error. I click on the unflag button and it retrieves the same confirmation page. If I click on it again I get a blank page with an error.
Only the unflag with confirmation "Field Entry Form" poses the problem.
The ajax flag works perfectly.

How can I correct this very annoying problem ?

How do I get the list of available tokens for the event series (or inherited event instances)? The Calendar module doesn't work as I intended with the Event dates (date ranges) in these recurring Events Series or Event Instances field widgets. However, the core Date Range field seems to work with the Calendar module.

Basically, I'd like to copy the date field in the event series widgets into a regular date range field so that it will play nicely with the Calendar module. I just need to access the tokens., if available.

Any help would be appreciated.

Thanks