Can not display content anymore

I am using the latest version of WordPress, WPastra Pro and Elementor Pro. After optimising my whole shop all my content seems gone.At least I can not view it as
i get the error message to load

<?php the_content(); ?>

but where? and why? I did not change anything I merelyadded wpsmushit tooptoimize pictures and deleted the plugin afterwards.
None of the tips here https://wpastra.com/docs/elementor-the-content-area-was-not-found-in-your-page/
or here
https://elementor.com/help/the-content-area-was-not-found-error/

worked for me

• This topic was modified 5 years, 5 months ago by CBD-Öl.

The page I need help with: [log in to see the link]