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i have the same error i fixed it before but now it has started again maybe can be caused by poor internet
@MrSanty7u7 you're playing on 4:3 black bars. Go into settings, and change the resolution to what your monitor supports, and set it to be 16:9 aspect ratio.
@MrSanty7u7 covered here https://forum.plutonium.pw/topic/6832/common-launcher-issues-solutions