Lightroom Denoise

[Daphnée32708478j8q5]

Hi,

When I try the new Lightroom Denoise option, it said 'this photo format is not supported by this fonction'.

I don't understand... My files are CR2 (Canon 6D), but most importantly, some days ago just after doing the update, I had try with a photo from this exact galery and it worked! But now it doesn't...

[Rikk Flohr: Photography]

Likely, they were shot as mraw or sraw, which do not qualify for DeNoise. 
A look at the pixel dimensions of the file will tell you if they are full raw or not.