Theme Inheritance - Problem Extending Parent Theme

I've followed the instructions to create a child theme based on X-Corporation: https://github.com/tranduyhung/grav-theme-x-corporation

With my child theme installed, I see the error ""Class 'Grav\Theme\Xcorporation' not found""

In order to verify that I'd followed the instructions correctly, I created a second theme "MyTheme" which extends Antimatter. This works without issue.

I noted that the X-Corporation theme which has a class called Xcorporation, is in a folder called "x-corporation" with an "x-corporation.php" and an "x-corporation.yaml". I've experimented with changing the folder and file names to 'Xcorporation' as to match the class name, to no avail.

What else should I try?
I'd really appreciate some help with this, otherwise I'm looking at hacking the parent theme directly or creating a new theme from scratch.

Thanks
SJS

what does your theme PHP file look like?

Apologies for the delay.
This is the version of theme PHP file when it's inheriting from Xcorporation.

Thanks
SJS

---php
<?php
namespace Grav\Theme;

class Mytheme extends Xcorporation
{
// Some new methods, properties etc.
}
?>

I think here the problem is the file is called x-corporation.php (https://github.com/tranduyhung/grav-theme-x-corporation/blob/master/x-corporation.php) and the autoloader does not find it, expecting xcorporation.php

Should be sorted with this commit: https://github.com/getgrav/grav/commit/874160480faf5d968a8f32a3f254618e4dd0ad0d