guyshahar on "[Plugin: All-in-One WP Migration] Error 500 When Reviewing Permalinks"

Hi - just migrated one WP site to another and seems to be working fine, but I was not able to save the Permalinks at the end of the process - I got an Error 500. Does this meant hat something went wrong?

https://wordpress.org/plugins/all-in-one-wp-migration/