I posted the code related to the errors that occurred: https://pastebin.com/zEUFmXBy
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This reply was modified 3 years, 5 months ago by Dragos RO.
After I updated the WP-Optimize plugin, the website stopped loading and “Error 503” appeared. I deleted the plugin to be able to access the website again.
Thanks for sugestion. The problem was resolved!
A plugin causing the problem!