NopCommerce 3.0 Installation give error: Sequence contains more than one element

Doing a clean install of NopCommerce 3.0

I specify my DB Connections etc, setup starts but then I get the following error:
Setup failed: Sequence contains more than one element

Not sure where to fix this.

Please help

I got the same error message. I had installed 3.0 be transfering it directly into my web server, and installed from there. Then I went to load the files in my computers local website and tried to connect my database using the database connection string. then got the error message. So i stopped the computer install. but when I went to my website in the admin section the topics menu had doubled up on all the topics. I reinstalled my database from a backup from the server and all went back to normal on the website.

I am going to try connecting to the local host database computer to see if I get the same error.

https://www.nopcommerce.com/boards/t/10620/200-beta-install-error-new-rev-existing-db.aspx