Blank Screen when Activating WHMCS Addon

Hi, when I try to activate the WHMCS MultiUser Provisioning Addon, I get a blank/White screen (Screenshot http://gyazo.com/5b0e9fe1b5c3cbee1297e8dca6e956e2 ). When I go back, the module is NOT activated. When I check my Apache Error logs (Screenshot http://gyazo.com/61dc1c0c62ee168b338d02bd6f4f69c2 ), they are empty. Any clue what's going on? I have the latest versions of the plugin and WHMCS.