Upgrading to BuddyPress 1.1.2

I got a notice in my dashboard that a more current version of Buddypress was available so clicked on the autoupdate option.

After deleting the previous version of the plugin and installing 1.1.2, I get the following error.

cannot redeclare bp_activity_install() (previously declared in /home/bookclub/public_html/wp-content/plugins/buddypress/bp-activity.php:19) in /home/bookclub/public_html/wp-content/plugins/buddypress/bp-activity.php on line 52

I also had notice that I could upgrade to the latest version of mu – (which maybe I should have done first). When I try and update now I get the following error

Fatal error: Class ‘BP_Groups_Group’ not found in /home/bookclub/public_html/wp-content/plugins/bp-group-calendar/bp-group-calendar.php on line 122