Dear @jonas
Thank you very much for your help. I did changes that you recommended and it worked 
But i still have a question.
I fixed all the parameters of constraints and remove efficiency constraint at the moment but i’m confused with this post RooStats: Change of Constraint does not change Profile Likelihood Plot . As my work is somehow similar to that and in this post moneta recommended to stay “sigma” parameter floating.
Should i also leave “sigma” floating and also parameter “mean” ?
Thank you!