Action does not implement the IFBCustomAction interface

I use Final Builder 8 build 8.0.0.2083
I add new Custom Action and Implement it in my .NET project. However, when I try to add it to Final builder project and run it, I got this error:
Error Executing Action: Action does not implement the IFBCustomAction interface

What can be a problem here?
Thanks for any help.

Hi Anderi,

If you could send your custom action to support@finalbuilder.com we will be able to assist you more with this issue.

Hi Jason,
I figured it out, why I got this error. It’s because I use wrong CustomActionApi.dll. Now it’s all working correctly