Permission problem...

Hello i need help... What i want my plugin to do is when a command is executed that it changes the users group to member.... but i got errors....

This is what i have:

Code:

package nl.gjosse.gjossep;
 
import java.util.logging.Logger;
 
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.plugin.java.JavaPlugin;
 
import com.nijiko.permissions.Entry;
import com.nijiko.permissions.Group;
import com.nijiko.permissions.PermissionHandler;
import com.nijikokun.bukkit.Permissions.Permissions;
 
import org.bukkit.plugin.Plugin;
 
 
 
 
public class EasyPr extends JavaPlugin {
      public static PermissionHandler permissionHandler;
 
 
    public static Logger log = Logger.getLogger("Minecraft");
 
 
 
 
 
    public void onEnable()
    {
        log.info("EasyPr has Enabled!"); 
          setupPermissions();
 
    }
 
    public void onDisable()
    {
        log.info("EasyPr has Disabled");
    }
 
 
 
 
 
public boolean onCommand(CommandSender sender, Command cmd, String commandLabel,String[] args)
{
    if(cmd.getName().equalsIgnoreCase("member")){
     
        if (!EasyPr.permissionHandler.inGroup("city", args[1], "Member"))
        {
                sender.sendMessage("This user already in the member group!");
 
          }
        else
        {
         
            Group g= "Member";
            Group d= "Default";
            Entry e = args[1];
 
            e.addParent(g);
            e.removeParent(d);
         
            sender.sendMessage("Done!");
     
        }
     
        return true;
          }
     
     
        return false;
   
 
     
}
 
 
private void setupPermissions() {
    if (permissionHandler != null) {
        return;
    }
 
    Plugin permissionsPlugin = this.getServer().getPluginManager().getPlugin("Permissions");
 
    if (permissionsPlugin == null) {
        log.info("Permission system not detected, defaulting to OP");
        return;
    }
 
    permissionHandler = ((Permissions) permissionsPlugin).getHandler();
    log.info("Found and will use plugin "+((Permissions)permissionsPlugin).getDescription().getFullName());
}
 
}

I know that this part is wrong but how do i fix it?

Code:

Group g= "Member";
Entry e = args[1];
 
            e.addParent(g);