When I merge three CR2 or dng files in Lightroom to Photoshop CC at 32 bits using Merge to HDR Pro i get the command above. I am using a Mac.
Previously using Windows I did not have this problem. Is there a solution?
Please try launching Photoshop once, it might solve this issue. Let us know if it works.
Sadly I have already tried this and it does not work.
Adobe has made it so the camera raw filter no longer not opens 32 bit/channel documents anymore.
The reason and workarounds: