Error when using paper-plugin.yml instead of plugin.yml

[TheDeafCreeper]

Server Version:

This server is running Paper version 1.21.4-165-main@fd69140 (2025-02-17T19:13:29Z) (Implementing API version 1.21.4-R0.1-SNAPSHOT)
You are 25 version(s) behind
Download the new version at: https://papermc.io/downloads/paper

[15:31:16 ERROR]: Could not pass event InventoryClickEvent to Wildcard v1.0
java.lang.IncompatibleClassChangeError: Found interface org.bukkit.inventory.InventoryView, but class was expected
        at wildcard-1.0-SNAPSHOT.jar/org.ipvp.canvas.MenuFunctionListener.handleGuiClick(MenuFunctionListener.java:92) ~[wildcard-1.0-SNAPSHOT.jar:?]
        at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:80) ~[paper-api-1.21.4-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[paper-api-1.21.4-R0.1-SNAPSHOT.jar:?]
        at io.papermc.paper.plugin.manager.PaperEventManager.callEvent(PaperEventManager.java:54) ~[paper-1.21.4.jar:1.21.4-165-fd69140]
        at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.callEvent(PaperPluginManagerImpl.java:131) ~[paper-1.21.4.jar:1.21.4-165-fd69140]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:628) ~[paper-api-1.21.4-R0.1-SNAPSHOT.jar:?]
        at net.minecraft.server.network.ServerGamePacketListenerImpl.handleContainerClick(ServerGamePacketListenerImpl.java:3195) ~[paper-1.21.4.jar:1.21.4-165-fd69140]
        at net.minecraft.network.protocol.game.ServerboundContainerClickPacket.handle(ServerboundContainerClickPacket.java:69) ~[paper-1.21.4.jar:1.21.4-165-fd69140]
        at net.minecraft.network.protocol.game.ServerboundContainerClickPacket.handle(ServerboundContainerClickPacket.java:14) ~[paper-1.21.4.jar:1.21.4-165-fd69140]
        at net.minecraft.network.protocol.PacketUtils.lambda$ensureRunningOnSameThread$0(PacketUtils.java:29) ~[paper-1.21.4.jar:1.21.4-165-fd69140]
        at net.minecraft.server.TickTask.run(TickTask.java:18) ~[paper-1.21.4.jar:1.21.4-165-fd69140]
        at net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoop.java:155) ~[paper-1.21.4.jar:1.21.4-165-fd69140]
        at net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask(ReentrantBlockableEventLoop.java:24) ~[paper-1.21.4.jar:1.21.4-165-fd69140]
        at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:1448) ~[paper-1.21.4.jar:1.21.4-165-fd69140]
        at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:176) ~[paper-1.21.4.jar:1.21.4-165-fd69140]
        at net.minecraft.util.thread.BlockableEventLoop.pollTask(BlockableEventLoop.java:129) ~[paper-1.21.4.jar:1.21.4-165-fd69140]
        at net.minecraft.server.MinecraftServer.pollTaskInternal(MinecraftServer.java:1428) ~[paper-1.21.4.jar:1.21.4-165-fd69140]
        at net.minecraft.server.MinecraftServer.pollTask(MinecraftServer.java:1422) ~[paper-1.21.4.jar:1.21.4-165-fd69140]
        at net.minecraft.util.thread.BlockableEventLoop.managedBlock(BlockableEventLoop.java:139) ~[paper-1.21.4.jar:1.21.4-165-fd69140]
        at net.minecraft.server.MinecraftServer.managedBlock(MinecraftServer.java:1379) ~[paper-1.21.4.jar:1.21.4-165-fd69140]
        at net.minecraft.server.MinecraftServer.waitUntilNextTick(MinecraftServer.java:1387) ~[paper-1.21.4.jar:1.21.4-165-fd69140]
        at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1264) ~[paper-1.21.4.jar:1.21.4-165-fd69140]
        at net.minecraft.server.MinecraftServer.lambda$spin$2(MinecraftServer.java:310) ~[paper-1.21.4.jar:1.21.4-165-fd69140]
        at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]

[TheDeafCreeper]

This seems fixed by simply switching the dependency Canvas is using to paper, so potentially caused by the hard fork?
idk if there's a practical way to have both spigot and paper support at the same time now so there might just need to be 2 versions, one using the spigot dependency and one using paper. (no code changes seem to be required at the moment)

Otherwise just adding the code to your project instead of using the dependency also probably fixes it.