Fernando,Are you using the DevExpress wrapper? If so, then this post may apply to you, otherwise it does not matter. I think the reason you may be having a problem is because you need to re-activate StrataFrame. You machine was never updated from the trial license, so your computer is not running the Unlimited StrataFrame license which could be causing some problems for you. To download your unlimited license, you only need to re-active through the License Information item under the StrataFrame menu inside of Visual Studio.
Once the form opens, click the "Start" button at the bottom right of the form. Let me know if this doesn't resolve your problem. You need to do this step regardless of your error.
P.S. You will need to exit Visual Studio and come back in before the new license takes effect.