An attempt to attach an auto-named database for file C:\Users \administrator.WESTCHASE\Documents\Visual Studio 2010\Projects\ClaimsEnableWebSite2\ClaimsEnableWebSite_STS\App_Data\aspnetdb.mdf failed. A database with the same name exists, or specified file cannot be opened, or it is located on UNC share.
And the fix is simple. This was the connection string I was using when I was getting the error. add name="LocalSqlServer" connectionString="data source=.\
and all that I had to do was add Database=aspnetdb to the connection string.