Saving setting not possible (fatal error)

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Hello!

I can not save any settings. I used the old version (3.2.5) and since today the new one (4.x). I could not save setting on both version. Is it a problem with my hosting?

Fatal error: Uncaught ArgumentCountError: Too few arguments to function sanitize_post_field(), 1 passed in /httpdocs/bndbz/wp-content/plugins/speakout/includes/class.settings.php on line 258 and at least 3 expected in /httpdocs/bndbz/wp-includes/post.php:2743 Stack trace: #0 /httpdocs/bndbz/wp-content/plugins/speakout/includes/class.settings.php(258): sanitize_post_field('default') #1 /httpdocs/bndbz/wp-content/plugins/speakout/includes/class.settings.php(161): dk_speakout_Settings->_clean_post_data() #2 /httpdocs/bndbz/wp-content/plugins/speakout/includes/settings.php(24): dk_speakout_Settings->update() #3 /httpdocs/bndbz/wp-includes/class-wp-hook.php(308): dk_speakout_settings_page('') #4 /httpdocs/bndbz/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters('', Array) #5 /httpdocs/bndbz/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #6 /httpdocs/bndbz/wp-admin/admin.php(259): do_action('speakout_page_d...') #7 {main} thrown in /httpdocs/bndbz/wp-includes/post.php on line 2743

Best regards,
Heiko

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