I got this report from Blame mod
10.11 14:19:14 [Server] INFO ****************** Blame Report Structure NBT 1.17-4.2.0-fabric ******************
10.11 14:19:14 [Server] INFO Failed to load structure nbt file from : mostructures:empty
10.11 14:19:14 [Server] INFO The path represented by this is: data/mostructures/structures/empty.nbt
10.11 14:19:14 [Server] INFO Most common cause is that there is a typo in this path to the nbt file.
10.11 14:19:14 [Server] INFO Please let the mod author know about this so they can double check to make sure the path is correct.
10.11 14:19:14 [Server] INFO A common mistake is putting the structure nbt file in the asset folder when it needs to go in data/structures folder.
10.11 14:19:14 [Server] INFO Stacktrace of where this NBT file is being called by: [java.base/java.lang.Thread.getStackTrace(Thread.java:1596), com.telepathicgrunt.blame.main.MissingNBTBlame.addMissingNbtDetails(MissingNBTBlame.java:56), net.minecraft.class_3485.handler$zkd000$blame_addMissingnbtDetails2(class_3485.java:535), net.minecraft.class_3485.method_15094(class_3485.java:65), net.minecraft.class_3485.method_15091(class_3485.java:53), net.minecraft.class_3470.(class_3470.java:59), io.github.frqnny.mostructures.structure.VolcanicVentStructure$Piece.(VolcanicVentStructure.java:64), net.minecraft.class_3195.method_28660(class_3195.java:151), net.minecraft.class_2852.method_12392(class_2852.java:415), net.minecraft.class_2852.method_12395(class_2852.java:175), net.minecraft.class_3898.method_17256(class_3898.java:512), java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1764), net.minecraft.class_1255.method_18859(class_1255.java:151), net.minecraft.class_3215$class_4212.method_18859(class_3215.java:528), net.minecraft.class_1255.method_16075(class_1255.java:125), net.minecraft.class_3215$class_4212.method_16075(class_3215.java:537), net.minecraft.class_3215.method_19492(class_3215.java:280), net.minecraft.server.MinecraftServer.method_20415(MinecraftServer.java:776), net.minecraft.server.MinecraftServer.method_16075(MinecraftServer.java:764), net.minecraft.class_1255.method_18857(class_1255.java:134), net.minecraft.server.MinecraftServer.method_16208(MinecraftServer.java:749), net.minecraft.server.MinecraftServer.method_3774(MinecraftServer.java:521), net.minecraft.server.MinecraftServer.method_3735(MinecraftServer.java:353), net.minecraft.class_3176.method_3823(class_3176.java:184), net.minecraft.server.MinecraftServer.method_29741(MinecraftServer.java:670), net.minecraft.server.MinecraftServer.method_29739(MinecraftServer.java:270), java.base/java.lang.Thread.run(Thread.java:831)]