Getting 503 service error with HTTP/2

#1
Hey! The very moment I enable HTTP/2 for JS, I get 503 service error for the wordpress. And there is nothing usefull I can find inside error logs. I made fresh install of CyberPanel onto CentOS 7, and installed wordpress from within the control panel. Then I added my custom SSL. Then uploaded theme, turned Light Cache plugin ON and stuck with this. Any idea on where to start looking?

error.log from /usr/local/lsws/logs
Code:
2018-02-22 13:41:46.655212 [INFO] [PlainConf] [httpServerConfig:] start parsing file /usr/local/lsws/conf/httpd_config.conf
2018-02-22 13:41:46.655255 [INFO] [PlainConf] [httpServerConfig:] RCS checkin config file /usr/local/lsws/conf/httpd_config.conf0 OK.
2018-02-22 13:41:46.655286 [NOTICE] Loading LiteSpeed/1.4.30 Open ...
2018-02-22 13:41:46.655305 [NOTICE] Using [BoringSSL]
2018-02-22 13:41:46.657221 [NOTICE] [ADMIN] server socket: uds://usr/local/lsws/admin/tmp/admin.sock.7516
2018-02-22 13:41:46.658458 [NOTICE] chroot is disabled.
2018-02-22 13:41:46.658504 [INFO] old priority: 0, new priority: 0
2018-02-22 13:41:46.658601 [INFO] [config:server:basics2] For better obscurity, server version number is hidden in the response header.
2018-02-22 13:41:46.684693 [INFO] [PlainConf] RCS checkin config file /usr/local/lsws/conf/mime.properties0 OK.
2018-02-22 13:41:46.685746 [NOTICE] [PID: 4425]: forked cgid: 4435
2018-02-22 13:41:46.686041 [INFO] [PlainConf] [adminConfig:] start parsing file /usr/local/lsws/admin/conf/admin_config.conf
2018-02-22 13:41:46.709138 [INFO] [PlainConf] [adminConfig:] RCS checkin config file /usr/local/lsws/admin/conf/admin_config.conf0 OK.
2018-02-22 13:41:46.711764 [INFO] [Module: modcompress 1.1] has been initialized successfully
2018-02-22 13:41:46.711926 [INFO] [Module: moddecompress 1.1] has been initialized successfully
2018-02-22 13:41:46.712104 [INFO] [Module: cache 1.56] has been initialized successfully
2018-02-22 13:41:46.714813 [NOTICE] The maximum number of file descriptor limit is set to 6000.
2018-02-22 13:41:46.715626 [NOTICE] [config:server:epsr:lsphp] 'Process Limit' probably is too low, adjust the limit to: 620.
2018-02-22 13:41:46.715677 [NOTICE] [config:server:rails] Cannot find ruby interpreter, Rails easy configuration is turned off
2018-02-22 13:41:46.715795 [INFO] [PlainConf] [virtualHostConfig:] start parsing file /usr/local/lsws/conf/vhosts/balticlarp.eu/vhost.conf
2018-02-22 13:41:46.740063 [INFO] [PlainConf] [virtualHostConfig:] RCS checkin config file /usr/local/lsws/conf/vhosts/balticlarp.eu/vhost.conf0 OK.
2018-02-22 13:41:46.742034 [INFO] Rewrite directive: <IfModule LiteSpeed> bypassed.
2018-02-22 13:41:46.742064 [INFO] Rewrite directive: RewriteEngine on bypassed.
2018-02-22 13:41:46.742078 [ERROR] Invalid rewrite directive: CacheLookup on
2018-02-22 13:41:46.742278 [INFO] Rewrite directive: </IfModule> bypassed.
2018-02-22 13:41:46.742295 [INFO] Rewrite directive: <IfModule mod_rewrite.c> bypassed.
2018-02-22 13:41:46.742311 [INFO] Rewrite directive: RewriteEngine On bypassed.
2018-02-22 13:41:46.742336 [INFO] RewriteBase [/] parsed, set to HttpContext 0x149b4b8.
2018-02-22 13:41:46.742368 [INFO] Rewrite directive: </IfModule> bypassed.
2018-02-22 13:41:46.742387 [INFO] RewriteFile [/home/balticlarp.eu/public_html/.htaccess] parsed, return 0.
2018-02-22 13:41:46.742840 [INFO] [PlainConf] [virtualHostConfig:] start parsing file /usr/local/lsws/conf/vhosts/Example/vhconf.conf
2018-02-22 13:41:46.771396 [INFO] [PlainConf] [virtualHostConfig:] RCS checkin config file /usr/local/lsws/conf/vhosts/Example/vhconf.conf0 OK.
2018-02-22 13:41:46.771613 [INFO] [PlainConf] [virtualHostConfig:] rewrite [] add rules [rewritecond %{HTTP_USER_AGENT}  ^NameOfBadRobot]
2018-02-22 13:41:46.771636 [INFO] [PlainConf] [virtualHostConfig:] rewrite [] add rules [rewriterule ^/nospider/         -   [F]]
2018-02-22 13:41:46.772087 [ERROR] [config:server:vhosts:vhost:Example:context:/protected/] Path for context location is invalid: /usr/local/lsws/Example/html/protected/
2018-02-22 13:41:46.772162 [INFO] [PlainConf] [virtualHostTemplate:] start parsing file /usr/local/lsws/conf/templates/ccl.conf
2018-02-22 13:41:46.800523 [INFO] [PlainConf] [virtualHostTemplate:] RCS checkin config file /usr/local/lsws/conf/templates/ccl.conf0 OK.
2018-02-22 13:41:46.800840 [INFO] [PlainConf] [virtualHostTemplate:] start parsing file /usr/local/lsws/conf/templates/phpsuexec.conf
2018-02-22 13:41:46.827846 [INFO] [PlainConf] [virtualHostTemplate:] RCS checkin config file /usr/local/lsws/conf/templates/phpsuexec.conf0 OK.
2018-02-22 13:41:46.828197 [INFO] [PlainConf] [virtualHostTemplate:] start parsing file /usr/local/lsws/conf/templates/rails.conf
2018-02-22 13:41:46.855344 [INFO] [PlainConf] [virtualHostTemplate:] RCS checkin config file /usr/local/lsws/conf/templates/rails.conf0 OK.
2018-02-22 13:41:46.855672 [NOTICE] [ZConfManager] No VHosts added, do not send!
2018-02-22 13:41:46.856608 [NOTICE] [AutoRestarter] new child process with pid=4472 is forked!
2018-02-22 13:41:46.857045 [NOTICE] [AutoRestarter] new child process with pid=4473 is forked!
2018-02-22 13:41:46.857472 [NOTICE] [AutoRestarter] new child process with pid=4474 is forked!
2018-02-22 13:41:46.857911 [NOTICE] [AutoRestarter] new child process with pid=4475 is forked!
2018-02-22 13:41:46.857874 [INFO] Stop listener *:7080.
2018-02-22 13:41:46.858020 [INFO] Stop listener *:7080.
2018-02-22 13:41:46.858196 [NOTICE] [child: 4472] Successfully change current user to nobody
2018-02-22 13:41:46.858306 [NOTICE] Child: 4472] Core dump is enabled.
2018-02-22 13:41:46.858414 [NOTICE] [Child: 4472] Setup swapping space...
2018-02-22 13:41:46.858622 [NOTICE] [child: 4474] Successfully change current user to nobody
2018-02-22 13:41:46.858656 [NOTICE] Child: 4474] Core dump is enabled.
2018-02-22 13:41:46.858705 [NOTICE] [Child: 4474] Setup swapping space...
2018-02-22 13:41:46.858722 [NOTICE] [Child: 4472] LiteSpeed/1.4.30 Open starts successfully!
2018-02-22 13:41:46.858786 [NOTICE] [Child: 4474] LiteSpeed/1.4.30 Open starts successfully!
2018-02-22 13:41:46.858911 [NOTICE] [child: 4473] Successfully change current user to nobody
2018-02-22 13:41:46.858878 [INFO] Stop listener *:7080.
2018-02-22 13:41:46.858973 [NOTICE] Child: 4473] Core dump is enabled.
2018-02-22 13:41:46.859070 [NOTICE] [Child: 4473] Setup swapping space...
2018-02-22 13:41:46.859215 [NOTICE] [Child: 4473] LiteSpeed/1.4.30 Open starts successfully!
2018-02-22 13:41:46.859817 [NOTICE] [child: 4475] Successfully change current user to nobody
2018-02-22 13:41:46.859870 [NOTICE] Child: 4475] Core dump is enabled.
2018-02-22 13:41:46.859942 [NOTICE] [Child: 4475] Setup swapping space...
2018-02-22 13:41:46.860144 [NOTICE] [Child: 4475] LiteSpeed/1.4.30 Open starts successfully!
2018-02-22 13:45:29.716382 [NOTICE] [87.247.76.50:59589:HTTP2-21] [STDERR] The WC_Cart::get_cart_url function is deprecated since version 2.5. Replace with wc_get_cart_url.
2018-02-22 13:46:23.785750 [NOTICE] [87.247.76.50:59589:HTTP2-51] [STDERR] The WC_Cart::get_cart_url function is deprecated since version 2.5. Replace with wc_get_cart_url.
 
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