Tonight I am attempting to open a Model-Driven App and am receiving the following error:
Try this action again. If the problem continues, check the Microsoft Dynamics 365 Community for solutions or contact your organization's Microsoft Dynamics 365 Administrator. Finally, you can contact Microsoft Support.
I have this app in 2 environments, 1 in a unmanaged solution, the other in a managed solution and I receive the same error on both.

@Pstork1