title: MIT Scheme: Unspecified return value error
body: <p>MIT Scheme: I was writing a function to calculate the nth term of the Fibonacci series (section 1.2.2 of SICP) but I am getting the error: Unspecified return value</p>
  
  <pre><code>(define (fib n) (
       define (fib-iter a b count) (
              if (= count n) a
              (fib-iter b (+ a b) (+ count 1)))
       (fib-iter 0 1 1))
  )
  </code></pre>
  
  <p>Thanks for the help.</p>