Error:
Severity Code Description Project File Line Suppression State
Error CS0433 The type 'DatabaseGeneratedOption' exists in both 'EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' and 'System.ComponentModel.DataAnnotations, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' MyApplications C:\Source\Repos\MyApplications\Models\ApplicationType.cs 98 Active
Fix:
The generated Sitefinity Assembly has a different Target .NET Framework.
Right Click a Project > Choose Properties > Ensure all Target Framework versions are the same. (Example 4.5)