Fatal Error

Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 121108 bytes) in /homepages/19/d462724560/htdocs/wp-includes/wp-db.php on line 1476

WordPress 4.9 running Virtue theme.
Elementor – 1.8.6

After editing text on my page, I wish to go to the Dashboard and quit working. I click Save, then Exit in the lower left corner of the page, then Dashboard and receive this Fatal Error.

Also, is it possible to insert images, documents, or new text between existing sections? What I am doing is rebuilding, recreating the entire site in Elementor. The text formats so much better in Elementor. You can see my rebuilt work below the the existing May 1945 page.

So at another time in the future, is it possible to go back to the page and reedit it. Adding new photos or text or documents. It seems that adding anything new only places it at the bottom of the page. How to insert new sections into existing work?

Thank you,
Jim

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