siravecavec on "[Plugin: MailChimp List Subscribe Form] Error on plugin activation"

When I try to activate the plugin from http://ioanaboutique.ro/wp-admin/plugins.php?action=activate&plugin&_wpnonce=de3584273fi Receive error about invalid headers
Like this in RO language:
Modulul nu conține un antet valid.
EN
The Plugin does not have a valid antet.

Any workaround this?

https://wordpress.org/plugins/mailchimp/