avr studio4 빌드문제

#include
int main( ){
volatile char a = 2, b=3, c , n ;
DDRA = 0xFF ;
c = a + b ;
c++ ;

PORTA = SREG ;
n = (char) 2 - c ;
n++ ;
}

이렇게 코드를 작성했는데 빌드가 안되요

Build started 24.4.2020 at 17:39:46
make: Makefile: No such file or directory
make: *** No rule to make target `Makefile'. Stop.
Build failed with 2 errors and 0 warnings...

이런 오류가 뜹니다.