Drupal 8.x

Hi all,
I am new in this community and in drupal. I started with a problem: after installing it, under administration I received this message: 

I am using view dataexport module to export my view results. Upon creating a Dataexport and tried viewing the page, I get server 500 error. the server log shows the below message:

Cannot declare class PhpOffice\PhpSpreadsheet\Spreadsheet, because the name is already in use in C:\projectx\web\modules\xls_serialization\src\Encoder\Spreadsheet.php on line 10

This is the code of PhpOffice\PhpSpreadsheet\Spreadsheet.php  file:

I am building my site at home with Drupal 8.8.1. But I cannot get mail sending to work with either swift pt phpmailer. With the latter, I get:

Hi 

I can't figure how to do this.

I have created my own Image Style in /admin/config/media/image-styles.

Inside my article with CKEditor, I add a new Image. Inside the formats I have enabled the use of Image styles so I can choose the format I want my image to use

But when I take a look at my page, the image style was not applied. I can only see an attribute in the code

<img alt="test" data-entity-type="" data-entity-uuid="" data-image-style="kraken" class="b-lazy b-loaded" src="/sites/default/files/actualites/N5246B.jpg">

Dear all,

I'm exploring the idea to use MongoDB for drupal installation, but I want to use MongoDB to store only files and use normal Mysql/MariaDB to store other informations. 

The question is: Is it possible to use MongoDB instead of sites/default/files (directory)? 

thanks for your time

best regards

Rino

I started working at Cyber-Duck in November 2019 and we're looking for some more mid-level or senior Drupal 8 (and Laravel) developers to join the Ducks. The roles will be UK based full-time preferably in our Elstree office just north of London although we do have a Farringdon office too. Because of some new projects we need to resource, you'll need to have lived in the UK for at least 3 years.

Skills: Drupal 8, PHP, MVC frameworks, git and all the stuff you'd normally expect to have from an experienced developer.