Package cannot be used by Unreal Engine 4.26.2

[gingerZone27]

Hello Mr. Haukvik! I've followed your hint to put the package in Engine/Plugins, enabled this plugin, and restarted the editor. But then comes an error showing "The following modules are missing or built with a different engine version". I tried to compile the project directly in VS2019, but still failed. I cannot even find this plugin under the Engine directory in VS2019.

I'm really interested in this type of easy messeaging tool, and could you please solve this problem for me? Or can you recommend some similar library to me? Thank you for your help.