appointments fatal error. Need help ASAP please

I get fatal error for Appointments+
and for WPMU DEV Dashboard plugin.
I tried to reinstall few times

Fatal error: Cannot redeclare class WPMUDEV_Update_Notifications in /home/eclipse/public_html/wp-content/plugins/wpmudev-updates/update-notifications.php on line 32

Warning: require_once(/home/eclipse/public_html/wp-content/plugins/appointments/includes/widgets.php) [function.require-once]: failed to open stream: No such file or directory in /home/eclipse/public_html/wp-content/plugins/appointments-1/appointments.php on line 153