I think I have found the solution to my problem. The problem is not due to that I have added duplicated share folder in options. It is because xolox uninstaller doesn't remove the registry entries. I have install xolox previously and has set the share folders, that's y the share folder is duplicated.

Also, I discovered that the uninstaller problem create yet another problem. I ran regedit and delete all "Xolox" entries and I ran the installer again, I get back the step by step setting up instructions, which I dun previously. So please use another installer program for xolox, I think the current one only install and remove files and folders and not registries which created a lot of problems.

Hope this helps.