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snm04

Exception in Thread.... help!!!

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hello, I am trying to make a simple java program to calculate weighted grades. The program compiles fine but when I run it it gives the error message "Exception in thread "main" java.lang.NoClassDefFoundError: Gradesmain" Here is my code: Gradesmain.java
import java.util.Scanner;

public class Gradesmain
{
	public static void main (String[] args)
	{
		Scanner scan = new Scanner(System.in);
		System.out.println ("This program computes your percentage out of a 100 for weighted grades");
		System.out.println ("How many sections of 100%?");
		int rows = scan.nextInt();

		double [][] list = new double[rows][3];

		int i = 0;
		int sec= 1;
		while (i < rows)
		{
			System.out.println("Values for Section " + sec);
			System.out.println("What is this section's weight out of 100%?");
			list[rows][0] = scan.nextDouble();

			System.out.println("What is your actual points?");
			list[rows][1] = scan .nextDouble();

			System.out.println("What are the total points possible?");
			list[rows][2] = scan.nextDouble();

			sec++;
			i++;
		}

		double [] toSum = new double[rows];
		for(int r = 0;r<rows; r++)
		{
			double weight;
			double actual;
			double outOf;
			weight = list[rows][0];
			actual = list[rows][1];
			outOf = list[rows][2];
			//Grade gr = new Grade(list[r][0],list[r][1],list[r][2]);
			toSum[r] = ((actual/outOf))*weight;
		}
		double total=0.0;

		for (int s=0; s < sec; s++)
		{
			total += toSum[s];
		}
		System.out.println (total);
	}
}


thanks

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