I can't launch my server

Hello guys! I would need your help if you had time : I did put custom dimensions on my server and I'm not 100% sure the problem comes from that, but my server don't want to start (sometimes it starts but 4 on 5 times it takes literally hours). The console keep repeating those lines : 11/21 6:25:54 PM [ERROR] at MC-BOOTSTRAP/[email protected]/com.mojang.serialization.codecs.PairMapCodec.decode(PairMapCodec.java:26) 11/21 6:25:54 PM [ERROR] at MC-BOOTSTRAP/[email protected]/com.mojang.serialization.MapDecoder$4.decode(MapDecoder.java:94) 11/21 6:25:54 PM [ERROR] at MC-BOOTSTRAP/[email protected]/com.mojang.serialization.MapCodec$1.decode(MapCodec.java:34) 11/21 6:25:54 PM [ERROR] at MC-BOOTSTRAP/[email protected]/com.mojang.serialization.MapDecoder.lambda$compressedDecode$1(MapDecoder.java:52) 11/21 6:25:54 PM [ERROR] at MC-BOOTSTRAP/[email protected]/com.mojang.serialization.DataResult.lambda$flatMap$11(DataResult.java:139) Would you know how to solve this problem please?