Erreur to activate the plugin

  • Hello,

    I just installed the latest version of Polylang. Then I wanted to install this plugin to manage my channels.

    Problem: Several errors in the administration and the plugin is unusable.

    “Notice: register_uninstall_hook was called incorrectly. Only a static class method or function can be used in an uninstall hook. Please see Debugging in WordPress for more information.
    ”

    and

    “( ! ) Warning: Cannot modify header information – headers already sent by (output started at /home/vagrant/clients/sofico/sofico-website/web/wp/wp-includes/functions.php:4161) in /home/vagrant/xxx/xxx/xxx-website/web/wp/wp-admin/includes/misc.php on line 1126
    ”

    Can you help me ?

    Thanks

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