I'm trying to create an Addin in EA

-Assembly is made visible in COM from Assembly info

-Project is registered for COM Interop

using MS VS C# 2015, .Net 4 and EA 13. but after following all the steps in tutorial below I face this error: Missing (0x800401f3).

[enter image description here](https://i.stack.imgur.com/1o0fm.jpg)

tutorial for Creating EA Addin: 
<https://bellekens.com/2011/01/29/tutorial-create-your-first-c-enterprise-architect-addin-in-10-minutes/>

thanks for your help.