Java Error: 'else' without 'if'

Here is my code:

public class DateDistance {

/**
 * Returns whether the given year is a leap year.
 */
public static boolean isLeapYear ( long year ) {
    year = Integer.parseInt(args[0]);

    if (year % 400 == 0)
        return true;
            else {
                if (year % 100 == 0)
                    return false;
                        } else {
                            if (year % 4 == 0)
                                return true;
                            } else {
                                return false;
                                    }
     }

public static void main ( String[] args ) {
    System.out.println(isLeapYear(Long.parseLong(args[0])));
      }    
}

I keep getting the following errors and do not know what is wrong.

DateDistance.java:16: error: 'else' without 'if'
                        } else {
                          ^
DateDistance.java:19: error: 'else' without 'if'
                            } else {
                              ^

I got rid of the ; after the if statements and have moved the brackets around to see if they were in the wrong spot but I still could not figure it out.