A lot of errors in my dashboard

Suddenly when I was removing some plugins I did not use, a lot of errors has been displaying about the content in my dashboard. It looks fine on the frontend, but in the dashboard it shows this:

Strict Standards: Declaration of BP_Settings_Component::setup_globals() should be compatible with BP_Component::setup_globals($args = Array) in /home/meeworkc/public_html/wp-content/plugins/buddypress/bp-settings/bp-settings-loader.php on line 198

Strict Standards: Declaration of BP_Settings_Component::includes() should be compatible with BP_Component::includes($includes = Array) in /home/meeworkc/public_html/wp-content/plugins/buddypress/bp-settings/bp-settings-loader.php on line 198

Strict Standards: Declaration of BP_Settings_Component::setup_nav() should be compatible with BP_Component::setup_nav($main_nav = Array, $sub_nav = Array) in /home/meeworkc/public_html/wp-content/plugins/buddypress/bp-settings/bp-settings-loader.php on line 198

Strict Standards: Declaration of BP_Settings_Component::setup_admin_bar() should be compatible with BP_Component::setup_admin_bar($wp_admin_nav = Array) in /home/meeworkc/public_html/wp-content/plugins/buddypress/bp-settings/bp-settings-loader.php on line 198

Strict Standards: Declaration of BP_Group_Member_Query::get_include_ids() should be compatible with BP_User_Query::get_include_ids($include = Array) in /home/meeworkc/public_html/wp-content/plugins/buddypress/bp-groups/bp-groups-classes.php on line 1182

Strict Standards: Redefining already defined constructor for class BP_Groups_Widget in /home/meeworkc/public_html/wp-content/plugins/buddypress/bp-groups/bp-groups-widgets.php on line 26

Strict Standards: Declaration of BP_Follow_Component::setup_globals() should be compatible with BP_Component::setup_globals($args = Array) in /home/meeworkc/public_html/wp-content/plugins/buddypress-followers/bp-follow-core.php on line 325

Strict Standards: Declaration of BP_Follow_Component::includes() should be compatible with BP_Component::includes($includes = Array) in /home/meeworkc/public_html/wp-content/plugins/buddypress-followers/bp-follow-core.php on line 325

Strict Standards: Declaration of BP_Follow_Component::setup_nav() should be compatible with BP_Component::setup_nav($main_nav = Array, $sub_nav = Array) in /home/meeworkc/public_html/wp-content/plugins/buddypress-followers/bp-follow-core.php on line 325

Strict Standards: Declaration of BP_Follow_Component::setup_admin_bar() should be compatible with BP_Component::setup_admin_bar($wp_admin_nav = Array) in /home/meeworkc/public_html/wp-content/plugins/buddypress-followers/bp-follow-core.php on line 325

Strict Standards: Declaration of BP_Portfolio_Component::setup_globals() should be compatible with BP_Component::setup_globals($args = Array) in /home/meeworkc/public_html/wp-content/plugins/buddypress-portfolio/includes/bp-portfolio-loader.php on line 159

Strict Standards: Declaration of BP_Portfolio_Component::includes() should be compatible with BP_Component::includes($includes = Array) in /home/meeworkc/public_html/wp-content/plugins/buddypress-portfolio/includes/bp-portfolio-loader.php on line 159

Strict Standards: Declaration of BP_Portfolio_Component::setup_nav() should be compatible with BP_Component::setup_nav($main_nav = Array, $sub_nav = Array) in /home/meeworkc/public_html/wp-content/plugins/buddypress-portfolio/includes/bp-portfolio-loader.php on line 159

Strict Standards: Non-static method BpfbBinder::serve() should not be called statically in /home/meeworkc/public_html/wp-content/plugins/buddypress-activity-plus/bpfb.php on line 113

Strict Standards: Non-static method BpfbCodec::register() should not be called statically, assuming $this from incompatible context in /home/meeworkc/public_html/wp-content/plugins/buddypress-activity-plus/lib/class_bpfb_binder.php on line 352

Strict Standards: Non-static method EasyContactFormsApplicationSettings::getInstance() should not be called statically in /home/meeworkc/public_html/wp-content/plugins/easy-contact-forms/easy-contact-forms.php on line 53

Strict Standards: Non-static method EasyContactFormsDB::getTableName() should not be called statically, assuming $this from incompatible context in /home/meeworkc/public_html/wp-content/plugins/easy-contact-forms/easy-contact-forms-baseclass.php on line 324

Strict Standards: Non-static method EasyContactFormsDB::select() should not be called statically, assuming $this from incompatible context in /home/meeworkc/public_html/wp-content/plugins/easy-contact-forms/easy-contact-forms-baseclass.php on line 145

Strict Standards: Non-static method EasyContactFormsDB::getWhere() should not be called statically, assuming $this from incompatible context in /home/meeworkc/public_html/wp-content/plugins/easy-contact-forms/easy-contact-forms-database.php on line 136

Strict Standards: Non-static method EasyContactFormsDB::wptn() should not be called statically, assuming $this from incompatible context in /home/meeworkc/public_html/wp-content/plugins/easy-contact-forms/easy-contact-forms-database.php on line 163

Strict Standards: Non-static method EasyContactFormsDB::getObjects() should not be called statically, assuming $this from incompatible context in /home/meeworkc/public_html/wp-content/plugins/easy-contact-forms/easy-contact-forms-database.php on line 165

Strict Standards: Non-static method EasyContactFormsDB::wptn() should not be called statically, assuming $this from incompatible context in /home/meeworkc/public_html/wp-content/plugins/easy-contact-forms/easy-contact-forms-database.php on line 75

Strict Standards: Non-static method EasyContactFormsDB::getTableName() should not be called statically, assuming $this from incompatible context in /home/meeworkc/public_html/wp-content/plugins/easy-contact-forms/easy-contact-forms-baseclass.php on line 324

Strict Standards: Non-static method EasyContactFormsDB::getValue() should not be called statically, assuming $this from incompatible context in /home/meeworkc/public_html/wp-content/plugins/easy-contact-forms/easy-contact-forms-baseclass.php on line 704

Strict Standards: Non-static method EasyContactFormsDB::wptn() should not be called statically, assuming $this from incompatible context in /home/meeworkc/public_html/wp-content/plugins/easy-contact-forms/easy-contact-forms-database.php on line 95

Strict Standards: Non-static method EasyContactFormsDB::getTableName() should not be called statically, assuming $this from incompatible context in /home/meeworkc/public_html/wp-content/plugins/easy-contact-forms/easy-contact-forms-baseclass.php on line 324

Strict Standards: Non-static method EasyContactFormsDB::getValue() should not be called statically, assuming $this from incompatible context in /home/meeworkc/public_html/wp-content/plugins/easy-contact-forms/easy-contact-forms-baseclass.php on line 704

Strict Standards: Non-static method EasyContactFormsDB::wptn() should not be called statically, assuming $this from incompatible context in /home/meeworkc/public_html/wp-content/plugins/easy-contact-forms/easy-contact-forms-database.php on line 95

Strict Standards: Declaration of BuddyBoss_Wall::setup_globals() should be compatible with BP_Component::setup_globals($args = Array) in /home/meeworkc/public_html/wp-content/themes/buddyboss/buddyboss-inc/buddyboss-wall/buddyboss-wall-loader.php on line 583

Strict Standards: Declaration of BuddyBoss_Pics::setup_globals() should be compatible with BP_Component::setup_globals($args = Array) in /home/meeworkc/public_html/wp-content/themes/buddyboss/buddyboss-inc/buddyboss-pics/buddyboss-pics-loader.php on line 302

Strict Standards: Non-static method BP_XProfile_ProfileData::get_value_byid() should not be called statically in /home/meeworkc/public_html/wp-content/plugins/buddypress/bp-xprofile/bp-xprofile-functions.php on line 175

Strict Standards: Non-static method BP_Core_User::get_core_userdata() should not be called statically in /home/meeworkc/public_html/wp-content/plugins/buddypress/bp-members/bp-members-functions.php on line 161

Strict Standards: Non-static method BP_Follow::get_counts() should not be called statically in /home/meeworkc/public_html/wp-content/plugins/buddypress-followers/_inc/bp-follow-functions.php on line 185

Strict Standards: Non-static method BP_Blogs_Blog::total_blog_count_for_user() should not be called statically in /home/meeworkc/public_html/wp-content/plugins/buddypress/bp-blogs/bp-blogs-functions.php on line 596

Strict Standards: Non-static method BP_Groups_Member::total_group_count() should not be called statically in /home/meeworkc/public_html/wp-content/plugins/buddypress/bp-groups/bp-groups-functions.php on line 513

Strict Standards: Non-static method BP_Messages_Thread::get_inbox_count() should not be called statically in /home/meeworkc/public_html/wp-content/plugins/buddypress/bp-messages/bp-messages-template.php on line 333

Strict Standards: Non-static method BP_Links_Link::get_total_link_count_for_user() should not be called statically in /home/meeworkc/public_html/wp-content/plugins/buddypress-links/bp-links-core.php on line 1589

Strict Standards: Non-static method BP_Links_Link::get_status_sql() should not be called statically in /home/meeworkc/public_html/wp-content/plugins/buddypress-links/bp-links-classes.php on line 916

Strict Standards: Non-static method BP_Groups_Group::get() should not be called statically in /home/meeworkc/public_html/wp-content/plugins/buddypress/bp-groups/bp-groups-functions.php on line 485

Strict Standards: Non-static method BP_Groups_Group::convert_orderby_to_order_by_term() should not be called statically in /home/meeworkc/public_html/wp-content/plugins/buddypress/bp-groups/bp-groups-classes.php on line 430

Strict Standards: Non-static method BP_Groups_Group::get_group_extras() should not be called statically in /home/meeworkc/public_html/wp-content/plugins/buddypress/bp-groups/bp-groups-classes.php on line 508

Strict Standards: Declaration of Walker_Nav_Menu_Edit_Roles::start_lvl() should be compatible with Walker_Nav_Menu::start_lvl(&$output, $depth = 0, $args = Array) in /home/meeworkc/public_html/wp-content/plugins/nav-menu-roles/inc/class.Walker_Nav_Menu_Edit_Roles.php on line 280

Strict Standards: Declaration of Walker_Nav_Menu_Edit_Roles::end_lvl() should be compatible with Walker_Nav_Menu::end_lvl(&$output, $depth = 0, $args = Array) in /home/meeworkc/public_html/wp-content/plugins/nav-menu-roles/inc/class.Walker_Nav_Menu_Edit_Roles.php on line 280

Strict Standards: Declaration of Walker_Nav_Menu_Edit_Roles::start_el() should be compatible with Walker_Nav_Menu::start_el(&$output, $item, $depth = 0, $args = Array, $id = 0) in /home/meeworkc/public_html/wp-content/plugins/nav-menu-roles/inc/class.Walker_Nav_Menu_Edit_Roles.php on line 280

Warning: Cannot modify header information - headers already sent by (output started at /home/meeworkc/public_html/wp-content/plugins/buddypress/bp-settings/bp-settings-loader.php:198) in /home/meeworkc/public_html/wp-includes/pluggable.php on line 899

What is all that? I was only deleting plugins, I did not use.