Whats the error in this code?

// This program uses an if/else if statement to assign a
// letter grade (A, B, C, D, or F) to a numeric test score.
#include
using namespace std;
int main()
{
int testScore;
cout << "Enter your test score and I will tell you\n";
cout << "the letter grade you earned: ";
cin >> testScore;
if (testScore < 60)
cout << "Your grade is F.\n";
else if (testScore < 70)
cout << "Your grade is D.\n";
else if (testScore < 80)
cout << "Your grade is C.\n";
else if (testScore < 90)
cout << "Your grade is B.\n";
else
cout << "That is not a valid score.\n";
else if (testScore <= 100)
cout << "Your grade is A.\n";
return 0;
}