BUILD FAILED PackagingResults:Error: Error Unknown Cook Failure

Development Platform & Builds
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There are a number of problems causing your build to fail… Make a back up of your Project folder then try these solutions:

  1. Right-click on the Contents folder in the Content Browser and select fix up redirectors in folder.
  2. Save all
  3. Delete your Intermediate and Saved folders from your Project Folder
  4. Delete the DerivedDataCache folder from the UE4 install directory

For the following errors:

eINTERNAL_ERROR : Gu::ConvexMesh::checkHullPolygons: Some hull vertices seems to be too far from hul
eINTERNAL_ERROR : Gu::ConvexMesh::checkHullPolygons: Some hull vertices seems to be too far from hull planes.

You will need to determine which custom model(s)/mesh(es) you have imported with these problems, typically caused by reversed normals in your original file.

For the following error:

Your CDO has had ExchangeNetRoles called on it (likely via RerunConstructionScripts) which should never have happened. This will cause issues replicating this actor over the network due to mutated transient data!

This ensure is caused by using Create Child Blueprint Class on a blueprint created from an empty actor. If your project packages and does not crash, you can safely ignore it, or you can try to locate which empty actor has had a child blueprint created from it.

Try fixing these errors first and then try packaging again. If if continues to fail, provide a new log.

Thanks,

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