java.lang.IncompatibleClassChangeError: class com.janboerman.invsee.spigot.api.SpectatorInventoryView has interface org.bukkit.inventory.InventoryView as super class at java.base/java.lang.ClassLoader.defineClass1(Native Method) ~[?:?] at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1027) ~[?:?] at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150) ~[?:?] at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:243) ~[paper-mojangapi-1.21-R0.1-SNAPSHOT.jar:?] at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:593) ~[?:?] at org.bukkit.plugin.java.PluginClassLoader.loadClass0(PluginClassLoader.java:169) ~[paper-mojangapi-1.21-R0.1-SNAPSHOT.jar:?] at org.bukkit.plugin.java.PluginClassLoader.loadClass(PluginClassLoader.java:164) ~[paper-mojangapi-1.21-R0.1-SNAPSHOT.jar:?] at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526) ~[?:?] at InvSee++.jar/com.janboerman.invsee.spigot.Impl_1_21.<init>(Setup.java:105) ~[InvSee++.jar:?] at InvSee++.jar/com.janboerman.invsee.spigot.SetupImpl.lambda$static$9(Setup.java:130) ~[InvSee++.jar:?] at InvSee++.jar/com.janboerman.invsee.spigot.Setup.setup(Setup.java:40) ~[InvSee++.jar:?] at InvSee++.jar/com.janboerman.invsee.spigot.InvseePlusPlus.onEnable(InvseePlusPlus.java:82) ~[InvSee++.jar:?] at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:288) ~[paper-mojangapi-1.21-R0.1-SNAPSHOT.jar:?] at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:202) ~[purpur-1.21.jar:1.21-2251-ac6c312] at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:109) ~[purpur-1.21.jar:1.21-2251-ac6c312] at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:520) ~[paper-mojangapi-1.21-R0.1-SNAPSHOT.jar:?] at org.bukkit.craftbukkit.CraftServer.enablePlugin(CraftServer.java:643) ~[purpur-1.21.jar:1.21-2251-ac6c312] at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:592) ~[purpur-1.21.jar:1.21-2251-ac6c312] at net.minecraft.server.MinecraftServer.loadWorld0(MinecraftServer.java:693) ~[purpur-1.21.jar:1.21-2251-ac6c312] at net.minecraft.server.MinecraftServer.loadLevel(MinecraftServer.java:455) ~[purpur-1.21.jar:1.21-2251-ac6c312] at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:361) ~[purpur-1.21.jar:1.21-2251-ac6c312] at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1171) ~[purpur-1.21.jar:1.21-2251-ac6c312] at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:332) ~[purpur-1.21.jar:1.21-2251-ac6c312] at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]
java.lang.IncompatibleClassChangeError: class com.janboerman.invsee.spigot.api.SpectatorInventoryView has interface org.bukkit.inventory.InventoryView as super class at java.base/java.lang.ClassLoader.defineClass1(Native Method) ~[?:?] at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1027) ~[?:?] at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150) ~[?:?] at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:243) ~[paper-mojangapi-1.21-R0.1-SNAPSHOT.jar:?] at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:593) ~[?:?] at org.bukkit.plugin.java.PluginClassLoader.loadClass0(PluginClassLoader.java:169) ~[paper-mojangapi-1.21-R0.1-SNAPSHOT.jar:?] at org.bukkit.plugin.java.PluginClassLoader.loadClass(PluginClassLoader.java:164) ~[paper-mojangapi-1.21-R0.1-SNAPSHOT.jar:?] at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526) ~[?:?] at InvSee++.jar/com.janboerman.invsee.spigot.Impl_1_21.<init>(Setup.java:105) ~[InvSee++.jar:?] at InvSee++.jar/com.janboerman.invsee.spigot.SetupImpl.lambda$static$9(Setup.java:130) ~[InvSee++.jar:?] at InvSee++.jar/com.janboerman.invsee.spigot.Setup.setup(Setup.java:40) ~[InvSee++.jar:?] at InvSee++.jar/com.janboerman.invsee.spigot.InvseePlusPlus.onEnable(InvseePlusPlus.java:82) ~[InvSee++.jar:?] at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:288) ~[paper-mojangapi-1.21-R0.1-SNAPSHOT.jar:?] at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:202) ~[purpur-1.21.jar:1.21-2251-ac6c312] at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:109) ~[purpur-1.21.jar:1.21-2251-ac6c312] at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:520) ~[paper-mojangapi-1.21-R0.1-SNAPSHOT.jar:?] at org.bukkit.craftbukkit.CraftServer.enablePlugin(CraftServer.java:643) ~[purpur-1.21.jar:1.21-2251-ac6c312] at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:592) ~[purpur-1.21.jar:1.21-2251-ac6c312] at net.minecraft.server.MinecraftServer.loadWorld0(MinecraftServer.java:693) ~[purpur-1.21.jar:1.21-2251-ac6c312] at net.minecraft.server.MinecraftServer.loadLevel(MinecraftServer.java:455) ~[purpur-1.21.jar:1.21-2251-ac6c312] at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:361) ~[purpur-1.21.jar:1.21-2251-ac6c312] at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1171) ~[purpur-1.21.jar:1.21-2251-ac6c312] at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:332) ~[purpur-1.21.jar:1.21-2251-ac6c312] at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]