Description
[2024.04.29-16.49.46:563][970]LogUObjectGlobals: Warning: LoadPackage can't find package /BEURRE_040824_041224/NewMaterialParameterCollection.
[2024.04.29-16.49.46:563][970]LogUObjectGlobals: Warning: LoadPackage can't find package /BEURRE_040824_041224/NewMaterialParameterCollection.
[2024.04.29-16.49.46:563][970]LogUObjectGlobals: Warning: Failed to find object 'Object /BEURRE_040824_041224/NewMaterialParameterCollection.NewMaterialParameterCollection'

Steps to Reproduce

  1. Launch UEFN.
  2. Create or load a project.
  3. Create a Material Blueprint.
  4. Create a Material Parameter Collections blueprint.
  5. Open the Material Blueprint.
  6. Insert the Material Parameter Collections blueprint in the newly created Material.
  7. Save the changes.
  8. In the Content Browser, right click the created material.
  9. Select "Asset Actions > Migrate..."
  10. Migrate the Material to another project.
  11. Load project to which the Material has been migrated.
  12. Double click the Material.

ACTUAL RESULT
UEFN crashes.
EXPECTED RESULT
The material editor opens.
Notes:

  • The issue also occurs when right-clicking the material or attempting to apply the material to an asset.

POST LINK: https://forums.unrealengine.com/t/editor-crashes-due-to-a-material-that-contains-mpcs-migrated-from-another-project/1826566

POST BODY:

  • Please select what you are reporting on:
    Unreal Editor for Fortnite
  • What Type of Bug are you experiencing?
    Assets
  • Summary
    I have migrated a material that contains a Material Parameter Collections from another UEFN project.
    Some behavior with that material caused the editor to crash.
  • Steps to Reproduce
    1. Select a material containing a MPCs, MPCs, textures, etc. and migrate them to another project. Assets Actions > Migrate...

2. Open the project you migrated to. (My editor still crashed at this point)

3. My editor crashed for all of the following actions.

  • Right-clicking or double-clicking on that material in the content browser
  • Selecting that material in the content browser and pressing the delete key.
  • Pressing the submit button to check in the project.
  • Expected Result
    We can migrate materials containing MPCs and open them successfully.
    The migration should not interfere with the check-in of the project.
  • Observed Result
    See "3. " in Steps to Reproduce
  • Platform(s)
    Windows
  • Additional Notes
    I could not delete the material in question, but revert option of URC enabled me to remove it. Then I check-in of the project.
CREATED AT: 04/28/2024 11:36 AM EDT
UPDATED AT: 04/28/2024 11:37 AM EDT

Have Comments or More Details?

There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-295255 in the post.

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Unresolved
ComponentUE - Graphics Features
Affects Versions29.30
Target Fix37.00
CreatedApr 29, 2024
UpdatedJun 9, 2025
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