I purchased and installed Dokan on 10 NOV 2014, and received the same error message. I am using new installs of WP, Woocommerce, and Dokan. I used the same “workaround” that Alprime mentioned above, and it has worked in testing for me also. Thanks Alprime for your suggestion. And thanks to Wedevs for what looks like a great product at a great price for small business.