ChunkDownloader Error "no FCoreDelegates::MountPak bound" when trying to "MountChunk"

I have .ucas and .utoc files generated and downloaded through ChunkDownloader.
But, it fails to mount .ucas and .utoc files, but it successfully mounts the .pak files, but at the end it sends a failure for mount complete callback.

Anyone knows how to solve this?
It seems like for the .ucas and .utoc files, the Decryptor is not valid.

@Kande Were you successful mounting the .ucas and .utoc files as well?