Solution:
1. Add the skip/bypass rule below to this wp-admin Custom Code text box: 3. CUSTOM CODE WPADMIN PLUGIN/FILE SKIP RULES
2. Click the Save wp-admin Custom Code button.
3. Go to the BPS Pro Setup Wizard page and rerun the Pre-Installation Wizard and Setup Wizard. For BPS free run the Setup Wizard.
# skip/bypass rule for the export.php file
RewriteCond %{REQUEST_URI} (export\.php) [NC]
RewriteRule . - [S=2]