LightSwitch v1 shows red X and unable to load data

Question

I have made an application using Visual Studio LightSwitch 2011 (v1) running on Visual Studio 2010 Professional. It is a desktop application, and I use SQL Server Authentica

Answer 1

I had same issue after updating my MDF and LDF it's started working. Meaning if you make any changes in database and the entity framework schema is not updated equally than you see this error. it's worked in my case