Hi Tracey
I apologize for any inconvenience caused.
Please, can you make sure that you have the last version of ATUM Export Pro?
If you have and the problem persists, please, I have to ask you to open a private ticket and attach there the error log.
Follow this link to know how to activate the error log: https://wordpress.org/support/article/debugging-in-wordpress/
And this is the link to open the private ticket: https://stockmanagementlabs.ticksy.com/tickets/
Best Regards,
Andrea.