I tried to install All in One Video Pack Sidebar Widget via Network Admin on my BuddyPress site.

Once the install was complete I clicked to activate on nework and got this error:

Fatal error: Call to undefined function wp_get_current_user() in /home/bridge21/public_html/wp-includes/capabilities.php on line 1028

I can no longer access Network Admin - i just get the message above every time i click on it. I can get to site admin.