When I am triying to add environment variable to firebase, I have the following error when doing firebase deploy --only functions
Error: Cannot understand what targets to deploy. Check that you specified valid targets if you used the --only or --except flag. Otherwise, check your firebase.json to ensure that your project is initialized for the desired features
I can't understand why i have this error (I previously managed to add environment variable on the same project)
Note : I have also tried add environment variable to a newly created project so my firebase.json is not empty