I’m investigating now. Can you provide more details (WP version, other plugins, where you’re seeing the error)?
I am getting the same error message, I get this message when I try to activate the plugin.
WP Version: 4.6.1
### Active Plugins (11) ###
LayerSlider WP: by Kreatura Media
Advanced Custom Fields: by Elliot Condon
Akismet: by Automattic
Contact Form 7: by Takayuki Miyoshi
Fusion Core: by ThemeFusion
Jetpack by WordPress.com: by Automattic
Slider Revolution: by ThemePunch
VaultPress: by Automattic
W3 Total Cache: by Frederick Townes
Yoast SEO: by Team Yoast
WP-Mail-SMTP: by Callum Macdonald
It is most likely the version of PHP being used that is the issue.
If you are using a shared host try adding…
AddHandler application/x-httpd-php56 .php .php5 .php4 .php3
to your .htaccess file
If PHP 5.6 is installed it will use it instead. This could cause conflicts elsewhere so test.
I am having the same issue??