Syntax error, insert “… VariableDeclaratorId” to complete FormalParameterList

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I am facing some issues with this code:

import edu.uci.ics.crawler4j.crawler.CrawlConfig;
import edu.uci.ics.crawler4j.crawler.CrawlController;
import edu.uci.ics.crawler4j.fetcher.PageFetcher;
import edu.uci.ics.crawler4j.robotstxt.RobotstxtConfig;
import edu.uci.ics.crawler4j.robotstxt.RobotstxtServer;

public class Controller {

     String crawlStorageFolder = "/data/crawl/root";
     int numberOfCrawlers = 7;

     CrawlConfig config = new CrawlConfig();
     config.setCrawlStorageFolder(crawlStorageFolder);
     /*
      * Instantiate the controller for this crawl.
      */
     PageFetcher pageFetcher = new PageFetcher(config);
     RobotstxtConfig robotstxtConfig = new RobotstxtConfig();
     RobotstxtServer robotstxtServer = new RobotstxtServer(robotstxtConfig, pageFetcher);
     CrawlController controller = new CrawlController(config, pageFetcher, robotstxtServer);

     /*
      * For each crawl, you need to add some seed urls. These are the first
      * URLs that are fetched and then the crawler starts following links
      * which are found in these pages
      */
     controller.addSeed("http://www.ics.uci.edu/~lopes/");
     controller.addSeed("http://www.ics.uci.edu/~welling/");
     controller.addSeed("http://www.ics.uci.edu/");
     /*
      * Start the crawl. This is a blocking operation, meaning that your code
      * will reach the line after this only when crawling is finished.
      */
     controller.start(MyCrawler.class, numberOfCrawlers);
 }

I am getting the following error:

“Syntax error, insert “… VariableDeclaratorId” to complete FormalParameterList” on config.setCrawlStrorageFolder(crawlStorageFolder)

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