Table Profile Provider - The settings property 'FirstName' was not found.

 Hi All,
 
I am having a frustrating time with the Table Profile Provider and need a bit of assistance. I am getting the following error when using the create user wizard:
 
I have chacked and the database has the correct table and field names and the properties have been added to my web.config. I have even downloaded and ran the sample on the sandbox site and get the same error.
 
Is there something elsei i can check?
 
Many Thanks,
G

 
 
1 Server Error in '/' Application. 2 The settings property 'FirstName' was not found. 3 Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error a ...