I have to check your site to see your installation and those settings. I can help you to install or set up Dokan plugin for you. Please provide your login details by using this form – http://wedevs.com/provide-login-details/. I will have a look what is going wrong.
I got your details and checked your installation. Everything is correct but there is a minor bug which need to fix and for that i need your ftp details. Can you please provide your ftp details using that details form?. I am here to help you.