Theme/Plugins installation failed problem

I recently installed a wordpress site from Plesk panel.

I can install themes and plugins from plesk panel without a problem but when I try to add a new theme from the WP dashboard, it gives me the following error: “An unexpected error occurred. Something may be wrong with or this server’s configuration. If you continue to have problems, please try the support forums.”

It is not just about themes. When I try to install plugins from WP dashboard I encounter “Installation failed: 403 Forbidden HTML” error…Server Error 403 Forbidden You do not have permission to access this document.

Another problem is the Elementor Widget Panel does not load and has the continuously spinning. I installed it from the Plesk panel. It is like WP trying to access some files but it just can’t.

I feel like all those problems have a link with each other but couldn’t find the reason yet.

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Author: mesakon