This is an issue with the way that Oracle is set up. Here's a link for troubleshooting it: http://ora-12154.ora-code.com/

1 think I would check would be the path to your solution. I had an issue where I was working on a project where there was a parenthesis in the folder name. (ex. C:\Users\MattP\Foo\Bar (2)) Removing the parenthesis fixed the problem in that case.

Edit: This article seems to be much more thorough in troubleshooting steps http://edstevensdba.wordpress.com/20...2154tns-03505/