Lux in tenebris
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Yes, most likely, these errors are due to third-party mods. Also, if you downloaded a modular map, delete it from the Maps folder as well.
Евангелие от Иоанна, 1.5: Lux in tenebris lucet, et tenebrae eam non comprehenderunt. Свет во тьме светит, и тьма не объяла его.