Invalid argument & Cannot modify header information

  • After installing I get instantly on the Settings-Page under
    “General” and under “Security” the same Message:

    Warning: call_user_func() expects parameter 1 to be a valid callback, no array or string given in /wp-admin/includes/template.php on line 1119

    The Login-Function works multiple times but only one day after installation. After 24 hours I get on the login page only the following messages:

    Warning: Invalid argument supplied for foreach() in /wp-content/plugins/wp-google-authenticator/admin/admin.class.php on line 255

    and

    Warning: Cannot modify header information – headers already sent by (output started at /wp-content/plugins/wp-google-authenticator/admin/admin.class.php:255) in /wp-includes/pluggable.php on line 881

    I use at present the following plugins:

    • 2 Click Social Media Buttons
    • A Graceful Sidebar Plugin
    • Captcha
    • Easy FancyBox
    • Insert PHP
    • Most and Least Read Posts Widget
    • Official StatCounter Plugin
    • Print Friendly and PDF
    • Search Everything
    • Search Meter
    • SortTable Post
    • Subscribe To Comments
    • WordPress Custom Sidebar

    https://www.ads-software.com/plugins/wp-google-authenticator/

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