Admin, After

Hello Admin,

After installing your wpmu dev dashboard plugin, I received this fatal error after clicking
"ACTIVATE". And I cannot open now my account because of this error.
Here is the message of fatal error I had received: Please help. Thanks a lot and more power.

"
Fatal error: Uncaught Error: Call to undefined function wp_get_current_user() in /home/spbmwo5/public_html/wp-includes/capabilities.php:539 Stack trace: #0 /home/spbmwo5/public_html/wp-content/plugins/wpmudev-updates/includes/class-wpmudev-dashboard-site.php(1433): current_user_can('activate_plugin...') #1 /home/spbmwo5/public_html/wp-content/plugins/wpmudev-updates/includes/class-wpmudev-dashboard-api.php(1252): WPMUDEV_Dashboard_Site->get_project_infos(119) #2 /home/spbmwo5/public_html/wp-content/plugins/wpmudev-updates/includes/class-wpmudev-dashboard-site.php(2610): WPMUDEV_Dashboard_Api->calculate_upgrades(Array) #3 /home/spbmwo5/public_html/wp-includes/class-wp-hook.php(300): WPMUDEV_Dashboard_Site->filter_plugin_update_count(Object(stdClass)) #4 /home/spbmwo5/public_html/wp-includes/plugin.php(203): WP_Hook->apply_filters(Object(stdClass), Array) #5 /home/spbmwo5/public_html/wp-includes/option.php(1630): apply_filters('site_transient_...', Object(stdClass), 'update_plugins') #6 /home/spbmwo5/public_html/wp-admin/in in /home/spbmwo5/public_html/wp-includes/capabilities.php on line 539"