Here you can see the issue:
So i changed to protostart to test:
There it is working, but when i get back to EasyShop it is a mess.
No idea how to fix it so restored the site.
All is working after disabeling the overrides of your shop.
But when i install it again you install your override again and the shop is crashing.
I get the feeling with this theme that it is not common used and every update it is fingers what will go wrong this time.
That does not give a good feeling about updating or using an other extension of RCA theme.
I wish you good luck with checking this out. And if you need my help with my site let me know.
For now it is working when i disable your checkout override.
Wish you a great day!