Hello yoona1219 and welcome to the Unreal Community.
From the error itself it seems the solution is there. “To fix this, reselect the asset in the project settings.” I would check the project settings where you have your maps selected and ensure it is set properly.
On another note:
Before packaging again, please ensure you have fixed up redirectors to clean any lingering redirectors if anything was renamed or moved during your development.
I hope this information was able to help you.