getting NZEC error in java

import java.util.Scanner;

class JuneChallenge {

static void decipher() {
    Scanner scanner = new Scanner(System.in);
    int testCases = scanner.nextInt();
    int decipherRules = 0, count = 0, start = 0;
    char rules[] = new char[256];
    char password[] = new char[1000000];

        for (int i = 0; i < testCases; i++) {

            for (int j = 0; j < 256; j++) {
                rules[j] = '\n';
            }
            count = 0;
            start = 0;
            decipherRules = scanner.nextInt();
            for (int j = 0; j < decipherRules; j++) {
                rules[scanner.next().charAt(0)] = scanner.next().charAt(0);
            }

            password = scanner.next().toCharArray();

            for (count = 0; count < password.length; count++) {
                if (rules[password[count]] != '\n')
                    password[count] = rules[password[count]];
                else
                    password[count] = password[count];
            }

            while (password[--count] == '0')
                ;

            // encountered a decimal, decrease the index
            if (password[count] == '.')
                count--;

            while ((password[start] == '0')) {
                start++;
            }

            for (int k = start; k <= count; k++) {
                System.out.print(password[k]);
          }
        }


}

public static void main(String[] args) {

    /*
     * JuneChallenge j = new JuneChallenge(); j.decipher();
     */
    JuneChallenge.decipher();
}

}

I am getting NZEC error in the following code for "forgot password question" july challenge, not able to identify the error, any help would be appreciated.