@ganesh_rajput, @Fabienne35, the problem is almost certainly that you actually have duplicate choice names in one or more of your lists. For example, you might have options with labels "Red" and Blue" that both have the name "2". This is a problem because you won't be able to tell in analysis whether the user selected red or blue. That's what the error is about.
Sometimes this is intentional because you want to do something like give red and blue the same "weight" when doing a calculation later. In that case, you can add a settings sheet (see http://xlsform.org/en/#settings-worksheet), add a column named allow_choice_duplicates and put the value yes below that heading.