Determining parameters on crawler4j

I am trying to use crawler4j like it was shown to be used in this example and no matter how I define the number of crawlers or change the root folder I continue to get this error from the code stating:

"Needed parameters: rootFolder (it will contain intermediate crawl data) numberOfCralwers (number of concurrent threads)" The main code is below:

public class Controller {

    public static void main(String[] args) throws Exception {

            if (args.length != 2) {
                    System.out.println("Needed parameters: ");
                    System.out.println("\t rootFolder (it will contain intermediate crawl data)");
                    System.out.println("\t numberOfCralwers (number of concurrent threads)");
                    return;
            }

            /*
             * crawlStorageFolder is a folder where intermediate crawl data is
             * stored.
             */
            String crawlStorageFolder = args[0];


            /*
             * numberOfCrawlers shows the number of concurrent threads that should
             * be initiated for crawling.
             */
            int numberOfCrawlers = Integer.parseInt(args[1]);

There was a similar question asking exactly what I want to know here , but I didn't quite understand the solution, like where I was to type java BasicCrawler Controller "arg1" "arg2" . I am running this code on Eclipse and I am still fairly new to the world of programming. I would really appreciate it if someone helped me understand this problem

If you aren't giving any arguments when you are running the file, you will get that error. Put the following as comment sin your code or delete it.

if (args.length != 2) {
                System.out.println("Needed parameters: ");
                System.out.println("\t rootFolder (it will contain intermediate crawl data)");
                System.out.println("\t numberOfCralwers (number of concurrent threads)");
                return;
        }

And after that set your root folder to the one where you want to store the meta data.