Unexpected response code 400

Thank you!!! I did it and it worked !!!, but now I am getting other problem:

------------------------------------------------------------------------
Building dropbox 1.0-SNAPSHOT
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--- exec-maven-plugin:1.2.1:exec (default-cli) @ dropbox ---
Tanny Nogales
Exception in thread "main" com.dropbox.core.v2.files.ListFolderErrorException: Exception in 2/files/list_folder: {".tag":"path","path":"not_found"}
	at com.dropbox.core.v2.files.DbxUserFilesRequests.listFolder(DbxUserFilesRequests.java:1621)
	at com.dropbox.core.v2.files.DbxUserFilesRequests.listFolder(DbxUserFilesRequests.java:1662)
	at com.neges.dropbox.Main.main(Main.java:35)
------------------------------------------------------------------------
BUILD FAILURE
------------------------------------------------------------------------
Total time: 3.336s
Finished at: Thu Jul 26 10:47:09 NDT 2018
Final Memory: 5M/123M
------------------------------------------------------------------------
Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.2.1:exec (default-cli) on project dropbox: Command execution failed. Process exited with an error: 1 (Exit value: 1) -> [Help 1]

To see the full stack trace of the errors, re-run Maven with the -e switch.
Re-run Maven using the -X switch to enable full debug logging.

For more information about the errors and possible solutions, please read the following articles:
[Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

If you see, I am correctly getting the username "tanny nogales", but I can't retrieve the files in the folder "neges" :(

My code is the following:

package com.neges.dropbox;

import com.dropbox.core.DbxException;
import com.dropbox.core.DbxRequestConfig;
import com.dropbox.core.v2.DbxClientV2;
import com.dropbox.core.v2.files.FileMetadata;
import com.dropbox.core.v2.files.ListFolderResult;
import com.dropbox.core.v2.files.Metadata;
import com.dropbox.core.v2.users.FullAccount;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.io.IOException;

public class Main {
    private static final String ACCESS_TOKEN = "ASDFG";

    public static void main(String args[]) throws DbxException, FileNotFoundException, IOException {
        
        // Create Dropbox client
        DbxRequestConfig config = DbxRequestConfig.newBuilder("dropbox/java-tutorial").build();
        DbxClientV2 client = new DbxClientV2(config, ACCESS_TOKEN);
        
        // Get current account info
        FullAccount account = client.users().getCurrentAccount();
        System.out.println(account.getName().getDisplayName());
        
        // Get files and folder metadata from Dropbox root directory
        ListFolderResult result = client.files().listFolder("/neges");
        while (true) {
            for (Metadata metadata : result.getEntries()) {
                System.out.println("Archivo: " + metadata.getPathLower());
            }

            if (!result.getHasMore()) {
                break;
            }

            result = client.files().listFolderContinue(result.getCursor());
            
        }
        
    }
}