[20:57:48] [Render thread/ERROR]: Couldn't parse loot modifier wstweaks:wstmodifier
com.google.gson.JsonSyntaxException: Missing type, expected to find a string
at net.minecraft.util.GsonHelper.m_13906_(GsonHelper.java:112) ~[client-1.18.1-20211210.034407-srg.jar%23195!:?]
at net.minecraftforge.common.loot.LootModifierManager.deserializeModifier(LootModifierManager.java:131) ~[forge-1.18.1-39.0.5-universal.jar%23199!:?]
at net.minecraftforge.common.loot.LootModifierManager.lambda$apply$0(LootModifierManager.java:115) ~[forge-1.18.1-39.0.5-universal.jar%23199!:?]
at java.util.ArrayList.forEach(ArrayList.java:1511) ~[?:?]
at net.minecraftforge.common.loot.LootModifierManager.apply(LootModifierManager.java:113) ~[forge-1.18.1-39.0.5-universal.jar%23199!:?]
at net.minecraftforge.common.loot.LootModifierManager.m_5787_(LootModifierManager.java:54) ~[forge-1.18.1-39.0.5-universal.jar%23199!:?]
at net.minecraft.server.packs.resources.SimplePreparableReloadListener.m_10789_(SimplePreparableReloadListener.java:13) ~[client-1.18.1-20211210.034407-srg.jar%23195!:?]
at java.util.concurrent.CompletableFuture$UniAccept.tryFire(CompletableFuture.java:718) ~[?:?]
at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:482) ~[?:?]
at net.minecraft.server.packs.resources.SimpleReloadInstance.m_143940_(SimpleReloadInstance.java:71) ~[client-1.18.1-20211210.034407-srg.jar%23195!:?]
at net.minecraft.util.thread.BlockableEventLoop.m_6367_(BlockableEventLoop.java:151) ~[client-1.18.1-20211210.034407-srg.jar%23195!:?]
at net.minecraft.util.thread.ReentrantBlockableEventLoop.m_6367_(ReentrantBlockableEventLoop.java:23) ~[client-1.18.1-20211210.034407-srg.jar%23195!:?]
at net.minecraft.util.thread.BlockableEventLoop.m_7245_(BlockableEventLoop.java:125) ~[client-1.18.1-20211210.034407-srg.jar%23195!:?]
at net.minecraft.util.thread.BlockableEventLoop.m_18701_(BlockableEventLoop.java:134) ~[client-1.18.1-20211210.034407-srg.jar%23195!:?]
at net.minecraft.client.Minecraft.m_91190_(Minecraft.java:2071) ~[client-1.18.1-20211210.034407-srg.jar%23195!:?]
at net.minecraft.client.gui.screens.worldselection.WorldSelectionList$WorldListEntry.m_101743_(WorldSelectionList.java:404) ~[client-1.18.1-20211210.034407-srg.jar%23195!:?]
at java.util.Optional.ifPresent(Optional.java:178) ~[?:?]
at net.minecraft.client.gui.screens.worldselection.SelectWorldScreen.m_101359_(SelectWorldScreen.java:75) ~[client-1.18.1-20211210.034407-srg.jar%23195!:?]
at net.minecraft.client.gui.components.Button.m_5691_(Button.java:40) ~[client-1.18.1-20211210.034407-srg.jar%23195!:?]
at net.minecraft.client.gui.components.AbstractButton.m_5716_(AbstractButton.java:16) ~[client-1.18.1-20211210.034407-srg.jar%23195!:?]
at net.minecraft.client.gui.components.AbstractWidget.m_6375_(AbstractWidget.java:111) ~[client-1.18.1-20211210.034407-srg.jar%23195!:?]
at net.minecraft.client.gui.components.events.ContainerEventHandler.m_6375_(ContainerEventHandler.java:27) ~[client-1.18.1-20211210.034407-srg.jar%23195!:?]
at net.minecraft.client.MouseHandler.lambda$onPress$0(MouseHandler.java:88) ~[client-1.18.1-20211210.034407-srg.jar%23195!:?]
at net.minecraft.client.gui.screens.Screen.m_96579_(Screen.java:527) ~[client-1.18.1-20211210.034407-srg.jar%23195!:?]
at net.minecraft.client.MouseHandler.m_91530_(MouseHandler.java:85) ~[client-1.18.1-20211210.034407-srg.jar%23195!:?]
at net.minecraft.client.MouseHandler.m_168091_(MouseHandler.java:185) ~[client-1.18.1-20211210.034407-srg.jar%23195!:?]
at net.minecraft.util.thread.BlockableEventLoop.execute(BlockableEventLoop.java:101) ~[client-1.18.1-20211210.034407-srg.jar%23195!:?]
at net.minecraft.client.MouseHandler.m_91565_(MouseHandler.java:184) ~[client-1.18.1-20211210.034407-srg.jar%23195!:?]
at org.lwjgl.glfw.GLFWMouseButtonCallback$Container.invoke(GLFWMouseButtonCallback.java:81) ~[lwjgl-glfw-3.2.2.jar%2348!:build 10]
at bre2el.fpsreducer.handler.glfw.InputEventHandler$MouseButtonEventHandler.invoke(InputEventHandler.java:133) ~[FpsReducer-forge-1.25-mc1.18.jar%23109!:1.25-mc1.18]
at org.lwjgl.glfw.GLFWMouseButtonCallbackI.callback(GLFWMouseButtonCallbackI.java:36) ~[lwjgl-glfw-3.2.2.jar%2348!:build 10]
at org.lwjgl.system.JNI.invokeV(Native Method) ~[lwjgl-3.2.2.jar%2344!:build 10]
at org.lwjgl.glfw.GLFW.glfwPollEvents(GLFW.java:3101) ~[lwjgl-glfw-3.2.2.jar%2348!:build 10]
at com.mojang.blaze3d.systems.RenderSystem.m_69495_(RenderSystem.java:202) ~[client-1.18.1-20211210.034407-srg.jar%23195!:?]
at com.mojang.blaze3d.platform.Window.m_85435_(Window.java:333) ~[client-1.18.1-20211210.034407-srg.jar%23195!:?]
at net.minecraft.client.Minecraft.m_91383_(Minecraft.java:1062) ~[client-1.18.1-20211210.034407-srg.jar%23195!:?]
at net.minecraft.client.Minecraft.m_91374_(Minecraft.java:660) ~[client-1.18.1-20211210.034407-srg.jar%23195!:?]
at net.minecraft.client.main.Main.main(Main.java:205) ~[client-1.18.1-20211210.034407-srg.jar%23195!:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[?:?]
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
at java.lang.reflect.Method.invoke(Method.java:568) ~[?:?]
at net.minecraftforge.fml.loading.targets.CommonClientLaunchHandler.lambda$launchService$0(CommonClientLaunchHandler.java:45) ~[fmlloader-1.18.1-39.0.5.jar%2323!:?]
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-9.0.7.jar%235!:?]
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:53) [modlauncher-9.0.7.jar%235!:?]
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71) [modlauncher-9.0.7.jar%235!:?]
at cpw.mods.modlauncher.Launcher.run(Launcher.java:106) [modlauncher-9.0.7.jar%235!:?]
at cpw.mods.modlauncher.Launcher.main(Launcher.java:77) [modlauncher-9.0.7.jar%235!:?]
at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26) [modlauncher-9.0.7.jar%235!:?]
at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23) [modlauncher-9.0.7.jar%235!:?]
at cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:90) [bootstraplauncher-0.1.17.jar:?]

hm, did the syntax for these things change?