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Lighting Build Failed

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    Lighting Build Failed

    I recently rebuilt a machine, and i haven't been able to get light to build. first i tested launcher versions of 4.22 and 4.23 but i couldn't get lightmass to build. then i installed the 4.24 source version of the engine, and manually built unrealLightmass in the solution, and that solution compiled fine, but when running a clean project, the lighting would still not build.
    other things i have troubleshooted based on forums searches:
    > tried running light build with windows defender mostly disabled (realtime disabled, firewall off, allowed apps in list if firewall is on)
    > checked to make sure multiple instances of swarm aren't running
    >cleared cache and validated through swarm
    >tried alternate directories for the cache
    >updated video drivers with updated directx as that is integrated into windows updates now
    >16Gb of RAM on machine, and just testing on a clean project, so i don't think memory is an issue
    none of these solutions led to a successful lighting build.
    the one error i do get in the swarm agent log is:
    [Interface:OpenJob] Error: Invalid class
    i have no clue what class this is referring to, but this is the error i got when testing on three different engine builds.
    are there any other things i may be overlooking?

    [RESOLVED] I re-installed windows, and consequently re-installed the engine as well, and now everything works. unfortunately I have to repopulate the machine with all of the production software again, but happy to have lightmass working.
    Last edited by paradoc; 12-26-2019, 08:42 PM.
    Earthborn Interactive | Flutter Bombs | Blast Point

    I build the ue4.24.3 from the github source code with the Development Editor option .I have the same problem and compile the
    UnrealLightmass.It works.