Installation errors after using installation wizard

I have followed the instructions here

The database gets installed, I can browse Nextcloud menus, but I can’t do any actions like uploading and creating users…

The server hosting company isn’t willing to help thought I think it might be a problem coming from too much limitations on their servers (just a thought)

here are some errors I see in the Administration > Overview tab

Please, a little help or hint would be appreciated

do you have a server or just web hosting?

Yes it’s web hosting

well. change the hosting company.