I wanted to test a cinematic that a created, but for some reason if i try to start a session, it will show me some error messages and won’t let me launch a session until i delete the camera.
Could you show the entire log? There should be a couple of lines above the one you sent which shows which asset is causing the issue. 
The error indicates that you’re using a regular Camera actor. Do you know how you created that camera? I’d be curious to know how you were able to create it because UEFN currently only allows creating Cinematic Camera actors.
In any case, if you switch over to a Cinematic Camera actor, it should allow you to launch a session.
Normally, clicking on the camera button in Sequencer as described here: Sequencer and Control Rig
would give you one of these: Cinematic Cameras in Unreal Engine | Unreal Engine 5.0 Documentation
I right click, add an actor and then i choosed Camera Actor.
Hello there!
Thanks for that info.
Basically, what @Max.Chen said is correct. You used the wrong type of camera.
To create a “Cinematic Camera”, you need to create one via the cube with a little green + next to it:
If you require any more assistance, be sure to let me know and I’ll see what I can do!
Regarding how people are able to create stuff like the normal camera, Migrating from UE 5.1 also migrates incompatible assets, such as Blueprints. Which is a useful feature when quickly wanting to migrate, but it’s very annoying to clean up if you have alot of unnecessary blueprints, things such as custom water blueprints.
I’d love if there was a way to toggle importing incompatible assets on or off.
Oh thank you!