Getting an error in Pattern 4

Respected Ma’am / Sir
I am getting an error in my code of pattern 4
Can you Please help me where my code is incorrect .

My Code is Given Below ;

package Lecture1;

import java.util.Scanner;

public class Pattern42m {

Scanner scn = new Scanner(System.in);
int n = scn.nextInt() ;
int nsp = n-1 ;
int nst= 1 ;

// row
int row =1 ; 
  while (row<= n)  {
	
	// space work
				int csp = 1;
				while (csp <= nsp ) {
				System.out.println(" ");
				csp++ ;
				}
				// stars work
				int cst  = 1 ;
				while ( cst <= nst ) {
					System.out.println("*");
			cst ++ ;
				}

			// prep
			System.out.println();
			nst++ ;
			nsp = nsp - 1;
		row++ ;

			}
}

}