Ok,
Slin und I found out that the SLX_content folder was missing and was creating these errors.
But I have another question:
First of all 2 Screens:
And no with activated shader:
The shots are from the same camera-position.
But as you can see the view with the activated shader looks as it's zoomed-in.
I can see this with every shader from this pack.
Is there any fix to this?