Here is the problem: I could activate but a few plugins,

Here is the problem: I could activate but a few plugins, and whenever I try to activate most of them I get this:

Strict Standards: Redefining already defined constructor for class User_Sync in /home/humami5/public_html/wp-content/plugins/user-sync/user-sync.php on line 47

Strict Standards: Non-static method BpfbInstaller::check_paths() should not be called statically in /home/humami5/public_html/wp-content/plugins/buddypress-activity-plus/lib/class_bpfb_installer.php on line 34

Notice: bbp_setup_current_user was called incorrectly. The current user is being initialized without using $wp->init(). Please see Debugging in WordPress for more information. (This message was added in version 2.3.) in /home/humami5/public_html/wp-includes/functions.php on line 3245

Notice: bp_setup_current_user was called incorrectly. The current user is being initialized without using $wp->init(). Please see Debugging in WordPress for more information. (This message was added in version 1.7.) in /home/humami5/public_html/wp-includes/functions.php on line 3245

Strict Standards: Non-static method BpfbBinder::serve() should not be called statically in /home/humami5/public_html/wp-content/plugins/buddypress-activity-plus/bpfb.php on line 119

Strict Standards: Non-static method BpfbCodec::register() should not be called statically, assuming $this from incompatible context in /home/humami5/public_html/wp-content/plugins/buddypress-activity-plus/lib/class_bpfb_binder.php on line 376

Strict Standards: Declaration of description_custom_walker::start_el() should be compatible with Walker_Nav_Menu::start_el(&$output, $item, $depth = 0, $args = Array, $id = 0) in /home/humami5/public_html/wp-content/themes/wpmu-dixi/functions.php on line 249
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Notice: Undefined property: stdClass::$url_type in /home/humami5/public_html/wp-content/plugins/ultimate-branding/ultimate-branding-files/modules/custom-admin-bar-files/inc/UB_Admin_Bar_Menu.php on line 129

I put the whole thing hoping it will be easier for you to help.

Best Regards!
David R