Frameroot SuperSu not supporting

 I have lenovo s8 tab..i want to install regional lenguage(Gujarati)..i have installed frameroot and supersu as u suggested..but its not working in my tablet as u mentioned.. I have installed supersu but when i opens it..its gives message..”There is a no su binary istalled.and super su can not install it”…so what should i do now..i want tp root my lenovo s8 tab..please help me out here..