The extension requires you have WooCommerce installed (http://wordpress.org/extend/plugins/woocommerce)
Please make sure you have that installed and it is the latest version (1.6.6).
I’m all of sudden getting the same error! And yes I have woocommerce installed.
Although.. The plugin I’m trying to install is woocommerce tab manager. http://www.woothemes.com/products/woocommerce-tab-manager/
Sorry guys, this was my oversight. The is_woocommerce_active() is included in a woo class that is present in most of our plugins, but I didn’t include in this one.
I’ll rework it and push a new version tomorrow and comment back here when it is active.
Ok… I disabled all my other woocommerce plugins and found when I deactivated WooSlider and then reactivated my other plugin it took. I was then able to go back and reactivate my other plugins.
Version 1.0.1 is deployed and resolves this fatal error issue.
Thanks for your patience.
It works thanks for the quick update, very much appreciated. 🙂