The error 2147204725 you are getting, could occur when the class name in your plugin is changed.
Your plugin may be registered the first time with a class named PluginClassName1, for example, and then registered (updated) a second time, after the class PluginClassName1 is changed to PluginClassName2. In this case, the plugin type, which is the plugin class implementing IPlugin
, is not retrieved in the already registered assembly.
Other causes could be changing the original assembly metadata (Culture, PublicKeyToken, Name, Version) or the signature key.
To solve the resulting issue, you should unregister the assembly and then re-register it again and also re-add the related steps/images.