Unable to edit post or pages - says 'processing'

Theme Name: FABLE v1.0
Wordpress : 5.5.1
Php : 7.0

Issue description: We are not able to edit any post or pages. While editing the page and select any page builder option it’s not opening and display as shown in the screenshot attached.

Site url: http://speen-sc-migration.globalizeme-dublin.co.uk/

Please can someone help.

Could someone please advice on this issue?