java - Trying to do a boolean loop -

i'm new , wanted try , loop kinda how i'm stuck. i'm getting these errors not sure though.

duplicate local variable minutes
duplicate local variable choice

type mismatch: cannot convert double string
operator / undefined argument type(s) string, double
operator / undefined argument type(s) string, double
type mismatch: cannot convert double string

     `import java.util.scanner;     public class looptest {    public static void main(string[] arge) {     scanner scanner = new scanner(system.in);     double minutes = 0;     double minutesperday;     double minutesperyear;     double years;     double days;     double choice;      boolean keepplaying = true;     while (keepplaying) {         string minutes;         string choice;          system.out.print("number of minutes");          minutes = scanner.nextdouble();          minutesperday = 60 * 24;         minutesperyear = minutesperday * 365;          years = (minutes / minutesperyear);         days = (minutes / minutesperday) % 365;          system.out.print(minutes + " about" + "\nyears:" + years  + "\ndays:" + days);          system.out.print("\nwant enter more minutes (y/n)? ");         choice = scanner.nextdouble();          if (choice.equals("y")) {             keepplaying = true;         } else {             keepplaying = false;         }         }  } } 

pretty simple: errormessage says:

duplicate local variable

which means 2 variables same name exist within same scope. in case double minutes , string minutes , same choice. string minutes 1 causing other errors, since java thinks minutes / minutesperyear means variable string minutes, not double minutes.