Unable to execute install.sh on RedHat Enterprise Linux 8

[jeff9finger-usda]

$ uname -a
Linux vmdi-be88-jeff-haynes 4.18.0-553.36.1.el8_10.x86_64 #1 SMP Fri Jan 10 05:56:06 EST 2025 x86_64 x86_64 x86_64 GNU/Linux

Distro: RedHat Enerprise Linux 8

Executed the folllowing and received the error output displayed. It appears that there is something missing in my system, but I don't know what.

./install.sh -n WhiteSur -t all -m -N stable -l --shell -i apple -h bigger --round

Oops! Operation failed...

=========== ERROR LOG ===========

Error: Invalid CSS after "...--accent-color:": expected expression (e.g. 1px, bold), was "@accent_bg_color;"
on line 177 of src/sass/gtk/_colors-libadwaita.scss

--accent-color: @accent_bg_color;

--------------------^

=========== ERROR INFO ==========
FOUND :
>>> install.sh
>>> lib-core.sh
>>> lib-install.sh
SNIPPET:
>>> [[ -n "${log}" ]]
TRACE :
>>> signal_error
>>> install_theemy
>>> install_themes
>>> main

=========== SYSTEM INFO =========
DISTRO : rhel;platform:el8;fedora;8.10
SUDO : no
DESKTOP : GNOME Shell 3.32.2
REPO : 2025-02-03T12:44:45-0600

[vinceliuice]

add -f option: ./install.sh -f -t all -m -N stable -l --shell -i apple -h bigger --round and try again

[jeff9finger-usda]

Thank you for the suggestion. It still fails though. Here is the error output:

  Oops! Operation failed...

  =========== ERROR LOG ===========
  >>> Error: Invalid CSS after "...--accent-color:": expected expression (e.g. 1px, bold), was "@accent_bg_color;"
  >>>         on line 177 of src/sass/gtk/_colors-libadwaita.scss
  >>> >>     --accent-color: @accent_bg_color;
  >>>    --------------------^
  
  =========== ERROR INFO ==========
  FOUND  :
    >>> install.sh
    >>> lib-core.sh
                             ••••    >>> lib-install.sh
  SNIPPET:
    >>> [[ -n "${log}" ]]
  TRACE  :
    >>> signal_error
    >>> install_theemy
    >>> install_themes
    >>> main
  
  =========== SYSTEM INFO =========
  DISTRO  : rhel;platform:el8;fedora;8.10
  SUDO    : no
  DESKTOP : GNOME Shell 3.32.2
  REPO    : 2025-02-07T02:52:14-0600

  HINT: You can google or report to us the info above 

  https://github.com/vinceliuice/WhiteSur-gtk-theme/issues