마인크래프트 분명 싱글플레이에서 최적화를 마친 모드맵을 멀티플레이로 옮겨서 실행해보니

[Server thread/ERROR]: Encountered an unexpected exception

java.lang.RuntimeException: Can't inject Forge block material. Registry remap is not support! (level.dat is from the old version or corrupted)

        at catserver.server.BukkitInjector.injectBlockBukkitMaterials(BukkitInjector.java:64) ~[BukkitInjector.class:git-CatServer-1.12.2-6eb82ffe]

        at net.minecraft.server.MinecraftServer.func_71247_a(MinecraftServer.java:331) ~[MinecraftServer.class:?]

        at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:330) ~[nz.class:?]

        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:642) [MinecraftServer.class:?]

        at java.lang.Thread.run(Unknown Source) [?:1.8.0_341]

[11:22:46] [Server thread/ERROR]: This crash report has been saved to: C:\Users\BINI\Desktop\포켓몬서버\.\crash-reports\crash-2022-07-22_11.22.46-server.txt

이렇게 뜨는데 뭐가 문제인가요?