"Please select a darker neutral area" while mask WB

Hello,

Whatever I do LR asks me to select a “darker neutral area” while I try to do the whit balance on orange mask.

I use VueScan in RAW with every parameters as told on the guide. My scanner is a Nikon CoolScan LS-8000.

Thank you for reading me :slight_smile:

UPing since it’s been a while :slight_smile: