Entity Framework 4.3 Migration Exception when Update-Database

Question

After upgrading from EF 4.2 and Migration to EF 4.3 and enabling migration,restarting Visual studio and everything , whenever I try to call Update-Database/Add-Migration I get this:

System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.ArgumentException:
The parameter is incorrect. (Exception from HRESULT: 0x80070057 (E_INVALIDARG))
--- End of inner exception stack trace ---
at System.RuntimeType.InvokeDispMethod(String name, BindingFlags invokeAttr, Object target, Object[] args, Boolean[] byrefModifiers, Int32 culture, String[] namedParameters)
at System.RuntimeType.InvokeMember(String name, BindingFlags bindingFlags, Binder binder, Object target, Object[] providedArgs, ParameterModifier[] modifiers, CultureInfo culture, String[] namedParams)
at System.Management.Automation.ComMethod.InvokeMethod(PSMethod method, Object[] arguments)
Update-Database : Exception has been thrown by the target of an invocation.
At line:1 char:1
+ update-database
+ ~~~~~~~~~~~~~~~
+ CategoryInfo : OperationStopped: (Exception has b... an invocation.:String) [Update-Database], RuntimeException
+ FullyQualifiedErrorId : Exception has been thrown by the target of an invocation.,Update-Database

I tried cleaning the whole project , deleting ef and migration and packages folder and doing it from the beginning and still same error !

Anyone facing the same error? Or have a solution for this?

Answer 1

Did you restart Visual Studio after upgrading?

---

Brice Lambson

Answer 2

Do you have your DbContext in a seperate (class library) project?

I did, and got the same exception.

You need to add -StartUpProjectName "Your Project Name" to the Add-Migration and UpdateDatabase commands.