Receiving error code and no idea why..

RomanNumerals.java:1: error: class, interface, or enum expected RomanNumerals.java ^ 1 error  

1 RomanNumerals.java 2 3 import java.util.Scanner; 4 5 class RomanNumerals 6 { 7 public static void main(String[] args) { 8 9 // Create a Scanner object for keyboard input. 10 Scanner keyboard = new Scanner(System.in); 11 12 // Get a number from the user. 13 System.out.print("Enter a number in the range of 1 - 10: "); 14 15 int number = keyboard.nextInt(); // User inputed number 16 17 //close stream 18 keyboard.close(); 19 20 // Get Roman numeral. 21 String romanNumerals = convertNumberToRomanNumeral(number); 22 23 // Output to user 24 System.out.println(romanNumerals); 25 } 26 static String convertNumberToRomanNumerals(Integer number) { 27 28 switch (number) { 29 case 1: 30 return "I"; 31 32 case 2: 33 return "II"; 34 35 case 3: 36 return "III"; 37 38 case 4: 39 return "IV"; 40 41 case 5: 42 return "V"; 43 44 case 6: 45 return "VI"; 46 47 case 7: 48 return "VII"; 49 50 case 8: 51 return "VIII"; 52 53 case 9: 54 return "IX"; 55 56 case 10: 57 return "X"; 58 59 default: 60 return "Invalid number."; 61 62 } 63 } 64 }