Luis,

>Hello Tim
>
>Thank you for all.
>I hope your answer while I'm checking other variable sets.

This does not appear to be related to the Evaluation Version. I am getting the same error and I am not running the Evaluation version.

I am geting the error on the same line as you and here is part of the problem. I think you are calling NewRow() which adds a row to the current dataset. At this point you do not have a dataset. Try using NewEntity() instead. For reference in case it comes up the actual line of code the error occurs on is in mmBusinessRule in theCheckRules method on this line.
return _entityList; and entityList happens to be null.

I changed it to oUsuarioEdit.NewEntity() and it worked except for you have another error in your UsuarioInsert where a parameter is expected on @IDUsuario which isn't supplied.

Also note you are saving a dataset like this: "dsUsuario" to the session and then later retrieving from the session like this: "dsUsuarios". Notice the "s" on the end.


Good luck
Tim