Problem with provider 5.1.2 Beta

[Claudio Correia]

I've been trying to use the new version to use with .net, I installed everything has described in another post, but when I try to use the login, it says when it's invalid but when the login is valid a exception is called, this is the exception result:
"A first chance exception of type 'System.Configuration.Provider.ProviderException' occurred in MySql.Web.dll"

I modified the web.config file, created the users and roles with the .asp net tool, I don't know what I'm doing wrong since it finds when the login is invalid, any help with this would be great

Thanks
Claudio C.