Radiometric Indices ERROR

Radiometric indices fail
When I generate radiometric indices with vegetation: NDVI, it generates the image BUT IN WHITE!
I’m following all description requests are on the link below

https://www.orfeo-toolbox.org/CookBook/Applications/app_RadiometricIndices.html

Hello,

If I understand correctly, the output has a constant value ? What is tis value ? 1 ?

Can you provide the command you used (or a screen of QGIS/monteverdi) ?

Are you sure you set the channels parameters have been set correctly ?

Cédric