That's weird, I haven't heard from other players about this problem. Maybe try installing the RTP for RPG Maker 2003 from this site, in the meantime I'll ask someone else if they know what to do.: https://www.rpgmakerweb.com/run-time-package
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Okay so also you may want to download this file and place it in the main folder https://rpgmaker.net/engines/rt2k3/utilities/74/