LiteSpeed ERROR 500 ROUNDCUBE

#1
So, after upgrading LiteSpeed to v5.3, Roundcube is throwing error 500...
When I switch back to Apache, it works fine.

Please advise.

Code:
root@vel:~# tail -n10 /usr/local/lsws/logs/access.log
returns nothing. No errors, whatsoever.
 
#5
Code:
aleksandar@vel:~$ plesk -v
Product version: Plesk Onyx 17.8.11
     Build date: 2018/06/13 11:00
     OS version: Ubuntu 18.04
       Revision: be9c98988e312a4ae46615a2d55dcf99e066a7cd
   Architecture: 64-bit
Wrapper version: 1.2
 
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