error: use of undeclared identifier 'GetVirtualTextureOutput0' - First Build try for windows -

These are the (infinite) repetation of errors that happens when i compile the build

I probably know that is related to the landscape material (somehow)

there is anybody who could know what is this problem ?

also, the build (at the end) fails. A texture problem could be the main culprit of a failed build ?

Any possible help is absolutely welcome.

Sorry guys..

another noob (very noob) question: folders in hierarchy of the project must have precise names ?

could it be that the engine can’t find files because i named and placed things in wrong way with custon folders name ?

@.@