sCategory permalink not working

hi everyone
i installed the sCategory Permalinks plugin in order to have the categories permalinks this way: https://www.mysite.com/myowncategory instead of https://www.mysite.com/category/myowncategory

unfortunately when i put %scategory% inside of the category base in teh permalinks options and go to test the permalinks i notice that the category link is something like https://www.mysite.com/%scategory%/myowncategory and if i click on it i obviously have a “bad request”…

does anyone knows where is the problem or if there’s another way to get to my goal? ??