Exception in thread "main" java.lang.Error: Unresolved compilation problem:at Datatypes.main(Datatypes.java:4)

package corejava;

public class Datatypes {
	public static void main(String[] args) {

		//byte
		byte num1 = 100;
		System.out.println(num1);
		
		//short
		short num2 = 100;
		System.out.println(num2);
		
		
		//int
		int num3 = 15000;
		System.out.println(num3);
		
		
		//long
		long num4 = 5555555555L;
		System.out.println(num4);
		
		
		//float
		float num5 = 15.254f;
		System.out.println(num5);
		
		
		//double
		double num6 = 15.28484;
		System.out.println(num6);
		
		
		//char
		char ch = 'A';
		System.out.println(ch);
		
		
		//String
		String str = "SG Testing Institute";
		System.out.println(str);
	}
}

ERROR:
Exception in thread "main" java.lang.Error: Unresolved compilation problem:

at Datatypes.main(Datatypes.java:4)

Working perfectly fine in my pc ..giving below output

100 100 15000 5555555555 15.254 15.28484 A SG Testing Institute

Can you please check JDK settings