Fatal error after activating buddy press
I have been trying to get sweet date working. It requires buddy press so I have tried to install the new version of that – 2.7.4, I believe. After it is activated, I get the white screen of death. After enabling debugging, I get the message below after activating buddy press. I switched back to the twenty fifteen theme and the behavior is the same.
Any ideas about how to get around this issue?
Fatal error: Uncaught Error:  operator not supported for strings in /Applications/MAMP/htdocs/wordpress/wp-content/plugins/buddypress/bp-activity/classes/class-bp-activity-component.php:281 Stack trace: #0 /Applications/MAMP/htdocs/wordpress/wp-includes/class-wp-hook.php(298): BP_Activity_Component->setup_admin_bar(”) #1 /Applications/MAMP/htdocs/wordpress/wp-includes/class-wp-hook.php(323): WP_Hook->apply_filters(NULL, Array) #2 /Applications/MAMP/htdocs/wordpress/wp-includes/plugin.php(453): WP_Hook->do_action(Array) #3 /Applications/MAMP/htdocs/wordpress/wp-content/plugins/buddypress/bp-core/bp-core-dependency.php(143): do_action(‘bp_setup_admin_…’) #4 /Applications/MAMP/htdocs/wordpress/wp-includes/class-wp-hook.php(298): bp_setup_admin_bar(Object(WP_Admin_Bar)) #5 /Applications/MAMP/htdocs/wordpress/wp-includes/class-wp-hook.php(323): WP_Hook->apply_filters(NULL, Array) #6 /Applications/MAMP/htdocs/wordpress/wp-includes/plugin.php(515): WP_Hook->do_action(Array) #7 /Applications/MAMP/htdocs/wordpress/wp-includes in /Applications/MAMP/htdocs/wordpress/wp-content/plugins/buddypress/bp-activity/classes/class-bp-activity-component.php on line 281
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