[23:11:03] [Server thread/ERROR]: Encountered an unexpected exception
java.lang.NoSuchMethodError: 'net.minecraft.class_2168 net.minecraft.class_3222.method_64396()'
        at knot/me.lucko.fabric.api.permissions.v0.Util.commandSourceFromEntity(Util.java:38) ~[fabric-permissions-api-v0-0.3.3-82369eda3a4fc310.jar:?]
        at knot/me.lucko.fabric.api.permissions.v0.Permissions.check(Permissions.java:174) ~[fabric-permissions-api-v0-0.3.3-82369eda3a4fc310.jar:?]
        at knot/eu.pb4.polymer.common.impl.CommonImplUtils.permissionCheck(CommonImplUtils.java:112) ~[polymer-common-0.9.19+1.21.1-7f498d932d46978.jar:?]
        at knot/eu.pb4.polymer.core.api.item.PolymerItemGroupUtils.getContentsFor(PolymerItemGroupUtils.java:39) ~[polymer-core-0.9.19+1.21.1-1b26b9a54c7ca504.jar:?]
        at knot/eu.pb4.polymer.core.impl.networking.payloads.s2c.PolymerItemGroupContentAddS2CPayload.of(PolymerItemGroupContentAddS2CPayload.java:30) ~[polymer-core-0.9.19+1.21.1-1b26b9a54c7ca504.jar:?]
        at knot/eu.pb4.polymer.core.impl.networking.PolymerServerProtocol.syncItemGroupContents(PolymerServerProtocol.java:213) ~[polymer-core-0.9.19+1.21.1-1b26b9a54c7ca504.jar:?]
        at knot/eu.pb4.polymer.core.impl.networking.PolymerServerProtocol.syncItemGroup(PolymerServerProtocol.java:199) ~[polymer-core-0.9.19+1.21.1-1b26b9a54c7ca504.jar:?]
        at knot/eu.pb4.polymer.core.impl.networking.PolymerServerProtocol.sendCreativeSyncPackets(PolymerServerProtocol.java:186) ~[polymer-core-0.9.19+1.21.1-1b26b9a54c7ca504.jar:?]
        at knot/eu.pb4.polymer.core.impl.networking.PolymerServerProtocol.sendSyncPackets(PolymerServerProtocol.java:126) ~[polymer-core-0.9.19+1.21.1-1b26b9a54c7ca504.jar:?]
        at knot/eu.pb4.polymer.core.impl.networking.PolymerServerProtocolHandler.lambda$register$0(PolymerServerProtocolHandler.java:36) ~[polymer-core-0.9.19+1.21.1-1b26b9a54c7ca504.jar:?]
        at knot/net.minecraft.class_3324.md47e386$polymer-networking$lambda$polymerNet$setupHandler$0$3(class_3324.java:8999) ~[server-intermediary.jar:?]
        at knot/eu.pb4.polymer.common.api.events.SimpleEvent.invoke(SimpleEvent.java:28) ~[polymer-common-0.9.19+1.21.1-7f498d932d46978.jar:?]
        at knot/net.minecraft.class_3324.handler$dga000$polymer-networking$polymerNet$setupHandler(class_3324.java:8999) ~[server-intermediary.jar:?]
        at knot/net.minecraft.class_3324.method_14570(class_3324.java:202) ~[server-intermediary.jar:?]
        at knot/net.minecraft.class_8610.mixinextras$bridge$method_14570$37(class_8610.java) ~[server-intermediary.jar:?]
        at knot/net.minecraft.class_8610.wrapOperation$dgc000$polymer-networking$polymerNet$prePlayHandshakeHackfest(class_8610.java:1038) ~[server-intermediary.jar:?]
        at knot/net.minecraft.class_8610.method_52408(class_8610.java:152) ~[server-intermediary.jar:?]
        at knot/net.minecraft.class_8736.method_53043(class_8736.java:22) ~[server-intermediary.jar:?]
        at knot/net.minecraft.class_8736.method_11054(class_8736.java:8) ~[server-intermediary.jar:?]
        at knot/net.minecraft.class_2600.method_11072(class_2600.java:27) ~[server-intermediary.jar:?]
        at knot/net.minecraft.class_3738.run(class_3738.java:18) ~[server-intermediary.jar:?]
        at knot/net.minecraft.class_1255.method_18859(class_1255.java:162) ~[server-intermediary.jar:?]
        at knot/net.minecraft.class_4093.method_18859(class_4093.java:23) ~[server-intermediary.jar:?]
        at knot/net.minecraft.server.MinecraftServer.method_24306(MinecraftServer.java:864) ~[server-intermediary.jar:?]
        at knot/net.minecraft.server.MinecraftServer.method_18859(MinecraftServer.java:173) ~[server-intermediary.jar:?]
        at knot/net.minecraft.class_1255.method_16075(class_1255.java:136) ~[server-intermediary.jar:?]
        at knot/net.minecraft.server.MinecraftServer.method_20415(MinecraftServer.java:846) ~[server-intermediary.jar:?]
        at knot/net.minecraft.server.MinecraftServer.method_16075(MinecraftServer.java:840) ~[server-intermediary.jar:?]
        at knot/net.minecraft.class_1255.method_18857(class_1255.java:145) ~[server-intermediary.jar:?]
        at knot/net.minecraft.server.MinecraftServer.method_18857(MinecraftServer.java:810) ~[server-intermediary.jar:?]
        at knot/net.minecraft.server.MinecraftServer.method_16208(MinecraftServer.java:815) ~[server-intermediary.jar:?]
        at knot/net.minecraft.server.MinecraftServer.method_29741(MinecraftServer.java:702) ~[server-intermediary.jar:?]
        at knot/net.minecraft.server.MinecraftServer.method_29739(MinecraftServer.java:281) ~[server-intermediary.jar:?]
        at java.base/java.lang.Thread.run(Thread.java:1583) [?:?]