View source for Fresh install produces a blank page

Greetings Wackos

I have just finished installing/setting up Wacko 6.0.15 on a XAMPP x64 7.4.13-0-VC15 (XAMPP 8.0.0-2-VS16 does not support IPS 4.4.9.2)

I did have to change the "//const CACHE_SESSION_DIR//" setting in **config/constants.php**.  After that all of the things were checked off.

It said everything was installed correctly, but when I clicked on "take me to the wiki" it gave me a blank page.

Following the advice in ((https://wackowiki.org/doc/Forum/Discussion/BlankPageAfterInstall1804LAMP this)) thread I enabled error reporting.  I then hit ctrl+F5 on my wiki url and got this error
(formatted to be easier to read)
<[Fatal error: Uncaught Error: Class 'Normalizer' not found in F:\ff\htdocs\wiki\class\ut.php:586 Stack trace:
#0 F:\ff\htdocs\wiki\class\wacko.php(6807): Ut::normalize('ForgottenFreedo...')
#1 F:\ff\htdocs\wiki\index.php(62): Wacko->run('ForgottenFreedo...', 'show')
#2 {main} thrown in F:\ff\htdocs\wiki\class\ut.php on line 586]>

Line 6807 of class/wacko.php is %% $tag = Ut::normalize($tag); %%
Line 62 of index.php is %% $engine->run($route['page'], $route['method']); %%
Line 586 of ut.php is %% static function normalize($string, $form = Normalizer::FORM_C) %%

Even if my PHP was not rusty, I still would not know where to begin to try and fix my issue.

System specs:
> Windows 10
> XAMPP 7.4.13
>> Includes: Apache 2.4.46
>> MariaDB 10.4.17
>> PHP 7.4.13
>> phpMyAdmin 5.0.4
>> OpenSSL 1.1.1
>> XAMPP Control Panel 3.2.4
>> Webalizer 2.23-04
>> Mercury Mail Transport System 4.63
>> FileZilla FTP Server 0.9.41
>> Tomcat 7.0.107 (with mod_proxy_ajp as connector)
>> Strawberry Perl 5.32.0.1 Portable
> Wacko r6.0.15

If there is any other information you need just let me know, and I will respond as soon as I can.

Thank you in advance.
*Brean*