Error: The server failed to install the new version of your content

General Issues and Bug Reporting
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Summary

Issues launching session in UEFN

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Live Edit

Steps to Reproduce

  1. I worked exclusively in Visual Studio to write and modify the code for my project.
  2. Once I finished coding, I opened UEFN (Unreal Editor for Fortnite).
  3. I clicked on Launch Session.
  4. I noticed error messages related to cooking and distributing content.

Expected Result

The session should launch successfully without any errors. The project should load into the game environment, allowing me to edit and test the island in real-time.

Observed Result

The session failed to launch. Error messages appeared, including:

  1. Failed to cook module
  2. errors.epicgames.content-service.cook_failure
  3. The server failed to install the new version of your content.
    This prevented me from testing or editing the project in the game environment.

Platform(s)

PC

Additional Notes

In the Message Log, under the Platform Cook section, I encountered the following three errors

  1. We encountered an error preparing your project. Error: errors.com.epicgames.content-service.cook_failure, An error occurred while communicating with the game servers.
  2. LogWindows: Error: appError called: Assertion failed: PropertyFlags & CPF_HasGetValueTypeHash
  3. LogWindows: Error: appError called: Assertion failed: PropertyFlags & CPF_HasGetValueTypeHash

This issue only occurs in this project. I tested another project, and everything worked correctly. A few days ago (I’m not certain how many), this project was working fine. However, when I tested it again yesterday, the errors started to appear.