theme setting error

whenever i try to do changes in the theme setting, while saving settings it throws me on optios,php fid attached screen shot of error

which shows something like following

Warning: This page allows direct access to your site settings. You can break things here. Please be cautious!

_cartflows_common
SERIALIZED DATA
_elementor_assets_data
SERIALIZED DATA
_elementor_global_css
SERIALIZED DATA
_elementor_installed_time
1641914644
_elementor_settings_update_time
1641917167
_site_transient_ai1wm_last_check_for_updates
1641879940
_site_transient_available_translations
SERIALIZED DATA
_site_transient_browser_11c4338e6d26ae4a4427e08a45877225
SERIALIZED DATA
_site_transient_community-events-83cbf11a4dc1aa4232d3f6b4bacdea90
SERIALIZED DATA

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Hello,

Thank you very much for choosing our theme and for contacting us.

Please, provide your site admin access (insert the site credentials into the Private content block under the message area) and confirm the permission for plugins deactivation, switching to the parent theme. As soon as we complete the testing we will enable all back, however, the site would be without plugins for 15-20 min. You would better make the full backup of your site.

Best Regards

[Author]

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