BuddyPress.org

Hello!
I just read everything about the same fatal error that was resolved for a multisite but in my case there is just a normal wordpress install in a subdirectory of my server.

My Installation is as follows:
WP version: 4.5.3
Web server: Apache (Linux serv01.esm7.siteground.biz 64-bit #13 SMP Tue Mar 15 13:23:00 EET 2016)
ABSPATH: /home/csrhella/public_html/csrh/community/
WP_CONTENT_DIR: /home/csrhella/public_html/csrh/community/wp-content
WP_PLUGIN_DIR: /home/csrhella/public_html/csrh/community/wp-content/plugins
Table prefix: red_acdc_
Peak memory usage: 43 MB
Current memory usage: 43 MB
Memory limit: 256M
PHP version: 5.4.45 – show PHP information (phpinfo)
MySQL version: 5.6.28
Curl version: 7.30.0 / SSL: OpenSSL/1.0.2h / libz: 1.2.3
OpenSSL version: OpenSSL 1.0.1p 9 Jul 2015
MCrypt: Yes
I have WP_DEBUG=TRUE
The Theme is a premium one: “THRIVE”
and my installed plugins are as in the image.

My problem is that when I install the Buddypress plugin I get the following message:

Notice: get_currentuserinfo is deprecated since version 4.5! Use wp_get_current_user() instead. in /home/csrhella/public_html/csrh/community/wp-includes/functions.php on line 3658

Fatal error: Call to undefined function bp_get_current_group_id() in /home/csrhella/public_html/csrh/community/wp-content/plugins/buddypress/bp-groups/classes/class-bp-group-extension.php on line 487

PLEASE HELP!