Method 'ExecuteAsync' in type 'System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy' does not have an implementation

Question

I am newer about using Code First in c#. After I enabled Migration in my project and launch my site, I get an Error:

Method \'ExecuteAsync\' in type \'System         


        

Answer 1

I +1'd @Spirit's answer for pointing me at the root of the issue, but I was able to fix it for myself by searching through all of the *.csproj files in the solution and replacing

packages\EntityFramework.6.1.3\lib\net40\EntityFramework.dll
                                   ^^^^^

with

packages\EntityFramework.6.1.3\lib\net45\EntityFramework.dll
                                   ^^^^^

I had a mix of usages in the projects. My symptom was that NCruch would get the exception on a test, but running the same test from NUnit test runner would pass just fine.