The type of invention patent claim is not clear, how to explain it?

What the examiner means is that your claim is not clear, and you can't protect both products and methods in one claim.

Take the invention "a fruit nutritious flour and its preparation method" listed above as an example. The usual practice is: the subject name of the former group of claims is "a kind of fruit nutritious flour"; The title of the latter group of claims is "a preparation method of fruit nutritional powder" or "a preparation method of fruit nutritional powder according to any one of claims 1~n".