I am using my own theme. So there is no other options page add-on declaration.
Fatal error: Cannot redeclare acf_set_options_page_title() (previously declared in /wp-content/plugins/acf-options-page/acf-options-page.php:564) in /wp-content/themes/tam/acf-options-page/acf-options-page.php on line 567
and as you can see the redeclaration is caused by the plugin acf-options-page.php
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