When building the level I get a warning;
Warning W066 (16355): Surfaces too big for shaded mode!

How do I know what block causes this error?
Of cource there is no block 16355, what does that number mean?
Is it not possible to point to the block that causes the warning?

This error means that the lightmaps in your level exceed the size that fit in a normal video card. This level can't be rendered on a normal PC.

Reduce the size of surfaces and/or use flat instead of shaded surfaces.

Thanks, but why don't you read and answer my questions?

If you mean your question about the block number: Because the error message is about the level and not about a block, there is no block number.

Ok, but what is the meaning of the number (16355) then?

I think it's an internal error number.

Ok, thanks.

This depends on your version. I think the warning won't be issued with the latest A7 version anymore, but with A5 the limit was 16 MB and with A6 it was 64 MB (if I remember right).

If you ignore the warning, your level will be rendered without shadows.