Make sure you have enabled dashboard page where [dokan-dashboard] shortcode has setted. To select the dashboard page please navigate to Dokan->Settings->Page Settings Tab->Select Dashboard page and let me know the result.
I've validated that there is one Dashboard page, it is enabled, and has only the necessary slug. The Dokan settings for the Dashboard page are configured to use the correct page. I'm still unable to view the Dashboard as a seller or admin.