Snort 3 configuration on CentOS 8 : Why is RULE_PATH undefined?

Hello everyone!
I'm working to install snort 3.1.47 on CentOS 8.5 while following the
"Snort 3.1.00 on CentOS 8 Stream" manual from Snort's official
documentation.
I finished configuring snort along with this manual and I'm now trying to
start Snort on my network interface using the following command.
/usr/local/snort/bin/snort -c /usr/local/snort/etc/snort/snort.lua -i
enp37s0 -l /var/log/snort --plugin-path /usr/local/snort/extra -k none
However, the output this command generates mentions the error FATAL:
ips.rules:2 undefined variable name: RULE_PATH while reading my snort.lua
file.

The content of the ips array inside my snort.lua file is as follows:

ips =
{
    mode = tap,
     rules = [[
        include $RULE_PATH/snort3-app-detect.rules
        include $RULE_PATH/snort3-browser-chrome.rules
        include $RULE_PATH/snort3-browser-firefox.rules
         ...
        include $RULE_PATH/snort3-x11.rules
   ]]
}


The RULE_PATH variable is defined in the snort_defaults.lua file:

---------------------------------------------------------------------------
-- default paths
---------------------------------------------------------------------------
-- Path to your rules files (this can be a relative path)

RULE_PATH = '../../rules'
BUILTIN_RULE_PATH = '../../builtin_rules'
PLUGIN_RULE_PATH = '../../so_rules'

-- If you are using reputation preprocessor set these
PASS_LIST_PATH = '../../intel'
BLOCK_LIST_PATH = '../../intel'

I don't understand why it would be undefined, because snort_defaults.lua is
imported at the beginning of the snort.lua file:

---------------------------------------------------------------------------
-- 2. configure defaults
---------------------------------------------------------------------------

-- HOME_NET and EXTERNAL_NET must be set now
-- setup the network addresses you are protecting
HOME_NET = [[ 192.168.1.0/24 ]]

-- set up the external network addresses.
-- (leave as "any" in most situations)
EXTERNAL_NET = 'any'

-- dofile(conf_dir .. '/snort_defaults.lua')
-- dofile(conf_dir .. '/file_magic.lua')

include 'snort_defaults.lua'
include 'file_magic.lua'

What could be making Snort think that my RULE_PATH variable is undefined?
I have googled to fix this issue, but I can't find the right solution.

Thanks you in advance for your answer,

Regards.

TianLing.

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