Unreal Engine crashes when trying to open a previously loaded level

Development Programming & Scripting
, , , , ,
1

I have an actor blueprint with a trigger box that loads the next level:

image
image2895×1144 288 KB

Pretty simple! When all the players walk into the trigger box, the next level is loaded.

It works fine if I’m going from Level_01 to Level_02 but if I want to go from Level_02 to Level_01, or from Level_03 to Level_02 etc, I get this error:

Warning: TravelFailure: ClientTravelFailure, Reason for Failure: 'Failed to load package '/Game/Maps/Level_02/UEDPIE_0_Level_02''. Shutting down PIE.

If I run the game in the standalone launcher it’s fine but it’s pretty slow to test things that way so it would be nice to fix this.

Thanks! :pray:

Log file:

2

The level name is perhaps wrong or not properly stored in the Level variable?

3

The level variable is an instance editable soft object reference so that in the editor, i’m presented with a dropdown list of all the levels in the project

image
image754×1290 82.5 KB

which, in theory, should rule out me spelling it wrong!

also I can go from level 01 to 02 but the problem seems to only ever arise if i’m trying to load/open a level that i’ve already been in

4

Hmm alright… just for testing purposes, have you tried to manually enter in the information to make sure it isn’t something to do with the variable? I am very sceptical, and suggest to always rule out bugs and other things before diving deeper.

5

Yes I had it that way before, I only changed it to the method I’m currently using because I was getting errors

6

Are you storing a reference to the “previous level” at runtime ?

If so, this could be causing PIE-specific issues because as you can see in the error message, PIE renames the loaded level into UEDPIE_#_LevelName. So if you store that in a variable, then you move to next level, then you try to come back to previous level, it doesn’t exist anymore.

Simplest way I can think of right now is to branch based on “Is Play In Editor” node and figure out how to cut the UEDPIE part from level name.

7

Hmm I tried looking through all my blueprints, there’s nothing that stores variables from the previous level specifically but I do reference the game instance to record things like health between levels etc.

I did try what @EliasWick suggested and changed the node from Open Level (by Object Reference) to Open Level (by Name) and it’s working again but I still don’t like that I don’t know why the former method wasn’t working :thinking:

I’m not 100% sure I understand your proposed solution - are you suggesting I append the world soft object variable before it gets plugged into the Open Level (by Object Reference) node?

Sorry, I really appreciate the help!

8

The Open Level node requires that the level name is supplied with a Name variable for it’s input. I am not certain why but that is what the input is requesting.

I read here: Blueprint Variables in Unreal Engine | Unreal Engine 5.0 Documentation, to find more information but all it says about the Name Variable is:

Variable Type Color Example Represents
Name Mauve get-name-variable-icon.png Piece of text used to identify something in the game.