paper 1.20.4 error same 1.21

[heeaart]

[21:00:38 ERROR]: Could not pass event BlockBreakEvent to FarmingUpgrade v1.7.0
java.lang.IllegalArgumentException: Material AIR is not harvestable.
at no.hyp.farmingupgrade.FarmingUpgradePlugin$ToolUpgrade.seeds(FarmingUpgradePlugin.java:396) ~[farmingupgrade-1.7.0.jar:?]
at no.hyp.farmingupgrade.FarmingUpgradePlugin.initiateHarvest(FarmingUpgradePlugin.java:489) ~[farmingupgrade-1.7.0.jar:?]
at no.hyp.farmingupgrade.FarmingUpgradePlugin.onFarm(FarmingUpgradePlugin.java:471) ~[farmingupgrade-1.7.0.jar:?]
at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor401.execute(Unknown Source) ~[?:?]
at org.bukkit.plugin.EventExecutor$2.execute(EventExecutor.java:77) ~[slimeworldmanager-api-1.20.4-R0.1-SNAPSHOT.jar:?]
at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:81) ~[slimeworldmanager-api-1.20.4-R0.1-SNAPSHOT.jar:git-SlimeWorldManager-15981]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[slimeworldmanager-api-1.20.4-R0.1-SNAPSHOT.jar:?]
at io.papermc.paper.plugin.manager.PaperEventManager.callEvent(PaperEventManager.java:54) ~[slimeworldmanager-1.20.4.jar:git-SlimeWorldManager-15981]
at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.callEvent(PaperPluginManagerImpl.java:126) ~[slimeworldmanager-1.20.4.jar:git-SlimeWorldManager-15981]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:615) ~[slimeworldmanager-api-1.20.4-R0.1-SNAPSHOT.jar:?]
at net.minecraft.server.level.ServerPlayerGameMode.destroyBlock(ServerPlayerGameMode.java:375) ~[?:?]
at net.minecraft.server.level.ServerPlayerGameMode.destroyAndAck(ServerPlayerGameMode.java:334) ~[?:?]
at net.minecraft.server.level.ServerPlayerGameMode.handleBlockBreakAction(ServerPlayerGameMode.java:272) ~[?:?]
at net.minecraft.server.network.ServerGamePacketListenerImpl.handlePlayerAction(ServerGamePacketListenerImpl.java:1833) ~[?:?]
at net.minecraft.network.protocol.game.ServerboundPlayerActionPacket.handle(ServerboundPlayerActionPacket.java:42) ~[?:?]
at net.minecraft.network.protocol.game.ServerboundPlayerActionPacket.a(ServerboundPlayerActionPacket.java:15) ~[?:?]
at net.minecraft.network.protocol.PacketUtils.lambda$ensureRunningOnSameThread$0(PacketUtils.java:54) ~[?:?]
at net.minecraft.server.TickTask.run(TickTask.java:18) ~[slimeworldmanager-1.20.4.jar:git-SlimeWorldManager-15981]
at net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoop.java:153) ~[?:?]
at net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask(ReentrantBlockableEventLoop.java:24) ~[?:?]
at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:1469) ~[slimeworldmanager-1.20.4.jar:git-SlimeWorldManager-15981]
at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:194) ~[slimeworldmanager-1.20.4.jar:git-SlimeWorldManager-15981]
at net.minecraft.util.thread.BlockableEventLoop.pollTask(BlockableEventLoop.java:126) ~[?:?]
at net.minecraft.server.MinecraftServer.pollTaskInternal(MinecraftServer.java:1446) ~[slimeworldmanager-1.20.4.jar:git-SlimeWorldManager-15981]
at net.minecraft.server.MinecraftServer.pollTask(MinecraftServer.java:1369) ~[slimeworldmanager-1.20.4.jar:git-SlimeWorldManager-15981]
at net.minecraft.util.thread.BlockableEventLoop.managedBlock(BlockableEventLoop.java:136) ~[?:?]
at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1520) ~[slimeworldmanager-1.20.4.jar:git-SlimeWorldManager-15981]
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1230) ~[slimeworldmanager-1.20.4.jar:git-SlimeWorldManager-15981]
at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:319) ~[slimeworldmanager-1.20.4.jar:git-SlimeWorldManager-15981]
at java.lang.Thread.run(Thread.java:1583) ~[?:?]
[21:00:38 ERROR]: §8[§4✖ §8]§r §7An error §cjava.lang.IllegalArgumentException §7was detected in thread §fServer thread
[21:00:38 ERROR]: §7Error: §cMaterial AIR is not harvestable.
[21:00:38 ERROR]: §fStack Trace:
[21:00:38 ERROR]: §8- §cno.hyp.farmingupgrade.FarmingUpgradePlugin$ToolUpgrade.seeds§8(§aFarmingUpgradePlugin.java:396§r§8) §f[farmingupgrade-1.7.0.jar]
[21:00:38 ERROR]: §8- §cno.hyp.farmingupgrade.FarmingUpgradePlugin.initiateHarvest§8(§aFarmingUpgradePlugin.java:489§r§8) §f[farmingupgrade-1.7.0.jar]
[21:00:38 ERROR]: §8- §cno.hyp.farmingupgrade.FarmingUpgradePlugin.onFarm§8(§aFarmingUpgradePlugin.java:471§r§8) §f[farmingupgrade-1.7.0.jar]
[21:00:38 ERROR]: §8- §ccom.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor401.execute§8(§4Unknown Source§r§8) §f[null]
[21:00:38 ERROR]: §8- §7org.bukkit.plugin.EventExecutor$2.execute§8(§aEventExecutor.java:77§r§8) §f[null]
[21:00:38 ERROR]: §8- §cco.aikar.timings.TimedEventExecutor.execute§8(§aTimedEventExecutor.java:81§r§8) §f[null]
[21:00:38 ERROR]: §8- §7org.bukkit.plugin.RegisteredListener.callEvent§8(§aRegisteredListener.java:70§r§8) §f[null]
[21:00:38 ERROR]: §8- §cio.papermc.paper.plugin.manager.PaperEventManager.callEvent§8(§aPaperEventManager.java:54§r§8) §f[null]
[21:00:38 ERROR]: §8- §cio.papermc.paper.plugin.manager.PaperPluginManagerImpl.callEvent§8(§aPaperPluginManagerImpl.java:126§r§8) §f[null]
[21:00:38 ERROR]: §8- §7org.bukkit.plugin.SimplePluginManager.callEvent§8(§aSimplePluginManager.java:615§r§8) §f[null]
[21:00:38 ERROR]: §8- §7net.minecraft.server.level.ServerPlayerGameMode.destroyBlock§8(§aServerPlayerGameMode.java:375§r§8) §f[null]
[21:00:38 ERROR]: §8- §7net.minecraft.server.level.ServerPlayerGameMode.destroyAndAck§8(§aServerPlayerGameMode.java:334§r§8) §f[null]
[21:00:38 ERROR]: §8- §7net.minecraft.server.level.ServerPlayerGameMode.handleBlockBreakAction§8(§aServerPlayerGameMode.java:272§r§8) §f[null]
[21:00:38 ERROR]: §8- §7net.minecraft.server.network.ServerGamePacketListenerImpl.handlePlayerAction§8(§aServerGamePacketListenerImpl.java:1833§r§8) §f[null]
[21:00:38 ERROR]: §8- §7net.minecraft.network.protocol.game.ServerboundPlayerActionPacket.handle§8(§aServerboundPlayerActionPacket.java:42§r§8) §f[null]
[21:00:38 ERROR]: §8- §7net.minecraft.network.protocol.game.ServerboundPlayerActionPacket.a§8(§aServerboundPlayerActionPacket.java:15§r§8) §f[null]
[21:00:38 ERROR]: §8- §7net.minecraft.network.protocol.PacketUtils.lambda$ensureRunningOnSameThread$0§8(§aPacketUtils.java:54§r§8) §f[null]
[21:00:38 ERROR]: §8- §7net.minecraft.server.TickTask.run§8(§aTickTask.java:18§r§8) §f[null]
[21:00:38 ERROR]: §8- §7net.minecraft.util.thread.BlockableEventLoop.doRunTask§8(§aBlockableEventLoop.java:153§r§8) §f[null]
[21:00:38 ERROR]: §8- §7net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask§8(§aReentrantBlockableEventLoop.java:24§r§8) §f[null]
[21:00:38 ERROR]: §8- §7net.minecraft.server.MinecraftServer.doRunTask§8(§aMinecraftServer.java:1469§r§8) §f[null]
[21:00:38 ERROR]: §8- §7net.minecraft.server.MinecraftServer.d§8(§aMinecraftServer.java:194§r§8) §f[null]
[21:00:38 ERROR]: §8- §7net.minecraft.util.thread.BlockableEventLoop.pollTask§8(§aBlockableEventLoop.java:126§r§8) §f[null]
[21:00:38 ERROR]: §8- §7net.minecraft.server.MinecraftServer.pollTaskInternal§8(§aMinecraftServer.java:1446§r§8) §f[null]
[21:00:38 ERROR]: §8- §7net.minecraft.server.MinecraftServer.pollTask§8(§aMinecraftServer.java:1369§r§8) §f[null]
[21:00:38 ERROR]: §8- §7net.minecraft.util.thread.BlockableEventLoop.managedBlock§8(§aBlockableEventLoop.java:136§r§8) §f[null]
[21:00:38 ERROR]: §8- §7net.minecraft.server.MinecraftServer.tickServer§8(§aMinecraftServer.java:1520§r§8) §f[null]
[21:00:38 ERROR]: §8- §7net.minecraft.server.MinecraftServer.runServer§8(§aMinecraftServer.java:1230§r§8) §f[null]
[21:00:38 ERROR]: §8- §7net.minecraft.server.MinecraftServer.lambda$spin$0§8(§aMinecraftServer.java:319§r§8) §f[null]