Help, Accidentally deleted cylinder from project now i get this error message, How do I fix?

Accidentally deleted cylinder mesh from project now i get this error message, before picking my project and again after project is loaded. I tried placing a new cylinder mesh in but I still get the same message. Anyone knows how to fix it? Any help is appreciated, thanks.

You can verify the engine from the Launcher :slight_smile:

How do I do that?

Sorry, for not getting back fastest. This work. Thank you very much.