Problem with saving project

Hello all,

I have a problem when I try to save my project in UE 4.10.1. I convert this project from version 4.8 to 4.10 and when i want to save appears this message:

This map is using externally referenced packages which won’t be found when in a game and all references will be broken. Perform a map check for more details. Would you like to continue?

What should I do so that does not appear any more?

Greetings,
Arek

Hum…at first sight i’d say don’t ‘Convert in place’ your project but ‘Open a copy’ of it instead.
Cheers.

I agree, that’s what I did.