Exception in thread "main"

I am doing java course from here but while doing assignment or any actvity in it I am getting this error:

>>> Compiling your code

Output:

>>> Exception in thread "main" java.util.NoSuchElementException
	at java.base/java.util.Scanner.throwFor(Scanner.java:937)
	at java.base/java.util.Scanner.next(Scanner.java:1594)
	at java.base/java.util.Scanner.nextInt(Scanner.java:2258)
	at java.base/java.util.Scanner.nextInt(Scanner.java:2212)
	at Main.main(Main.java:6)


Runtime Error (NZEC)

Execution Time:

>>> 0.09s

Memory Used:

>>> 12440kb