As far as I know my code is correct. It doesn't return an error but instead says "The program took too long to respond. Check your code for infinite loops and try again." Could someone please explain to me why this is happening? Thank you!

```
$VERBOSE = nil # We'll explain this at the end of the lesson.
require 'prime' # This is a module. We'll cover these soon!
def first_n_primes(n)
return "n is a interger." unless n.is_a? Interger
return "n must be greater than 0." if n <= 0
prime_array ||= []
prime = Prime.new
for num in (1..n)
prime_array.push(prime.next)
end
return prime_array
end
```