DPP 4.15 Error message

[DNG]

Hi

I have never used DPP, normally Lightroom and a little Photoshop. I have just tried my first focus stack that I took on my R5.

I selected my 15 images (JPEG 5000 x 5000) and clicked start depth compositing tool and got the following message:-

"Cannot start depth compositing tool.

Not available for that focused image."

I cannot find what that means and whart the problem is.

[jrhoffman75]

Great image.

[FloridaDrafter]

I really like that, nice shot!

[DNG]

Thanks again!