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Hi guys! I am facing this issue when I try to upload a .json template file I created from my staging site. When I try to import that file from the template dashboard, I get redirected to /admin-ajax.php with a Bad gateway error code 502. I tried creating a new page and uploading the file from elementor edit window, Import template to your library but I got an error too (An error occurred, try again).
I got this log data, hope it might help.
Attempt to read property “labels” on nullLine : 694/var/www/wptbox/wp-content/plugins/elementor/app/modules/import-export/module.php
I appreciate your help.