My code gives me the error :"(ruby):7: syntax error, unexpected tSTRING_BEG, expecting keyword_end

return if n <= 0 "n must be greater than 0."

^"

```
$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 unless n.is_a? Integer "n must be an integer."
return if n <= 0 "n must be greater than 0."
prime_array ||= []
prime = Prime.new
for num in (1..n)
prime_array.push(prime.next)
end
return prime_array
end
first_n_primes(10)
```