Skyrim CK line 806 error - preview render

[Yanazake]

Edited the topic to fit current situation.

Seems like there are some errors showing that should be normal, but I managed to reduce them by reinstalling the CK.

Still, the "line: 806" error when trying to use preview of a character's body/head persists.

The window shows the following message:

Assert

File:
C:\_Skyrim\Code\TESV\BSShader\shaders\BSLightningShaderProperty.c
PP

Line: 806

What can I do to fix this and use the preview window normally??

That's basically it. I try to load JUST Skyrim.esm and I get a bunch of errors, the first one being about "quest.pex"...

Is this NORMAL? I heard it was, but the part that it also shows bug messages when I try to load any preview model, and doesn't show the model at all shouldn't be, right?

I'm trying to create/edit a new custom race, but the CK isn't helping much.