Warning: STEAM: Cannot create session 'GameSession': session already exists

I’m using advanced sessions and steam online subsystem. When I launch the game in standalone mode I can make a lobby but a friend can’t join it. When I package the game I can’t create a session and this error message comes up Warning: STEAM: Cannot create session 'GameSession': session already exists.
Can anyone help me, I have been trying to figure this out for hours.

I found the solution. I forget that I changed the destination of my lobby map and didn’t change the packaged map file path.

Just to make the answer simpler make sure to go to project settings>Packaging and where it says (List of maps to include in packaged build) Make sure to add the Maps that you are using or else you will get this error. So for example /Game/Maps/Level1