"No Bitmap Buffer Specified" Warning message using V-Ray GPU - can't find what this is and how to fix it or get rid of it?

[JezUK]

Please can someone explain why I get this Warning message during V-Ray GPU rendering?

I'd like, if possible, to be able to fix this.

See attached, if needed.

Many thanks.

[Morne]

that looks like a bitmap texture to me, but wihtout having an actual bitmap (jpg or whatever) loaded into it

weird that it would warn you about it and not just skip over it

(I could be wrong of course!)