WooCommerce Activation

Can someone give me some advice... I'm sure it's something simple but I am missing the answer none the less! So, I want an e-commerce portion for my blog; therefore, I continue to attempt to download the plug-in, WooCommerce, and it downloads and then when I click on the "Activate" button, a message pops up stating a "fatal error" has occurred and will not activate nor do anything else without me clicking on the back arrow button... can anyone give me a clue why this is happening? Thanks!