I checked the historyissues and I think this might be an old problem. I am using the latest fabric-api-0.43.0 and Fabric 0.12.5

Description: Unexpected error

java.lang.NoSuchMethodError: 'void net.minecraft.class_318.method_22690(java.io.File, java.lang.String, int, int, net.minecraft.class_276, java.util.function.Consumer)'
at io.github.ultimateboomer.resolutioncontrol.ResolutionControlMod.saveScreenshot(ResolutionControlMod.java:130)
at io.github.ultimateboomer.resolutioncontrol.ResolutionControlMod.setShouldScale(ResolutionControlMod.java:185)
at net.minecraft.class_757.handler$zkc000$onRenderWorldEnd(class_757.java:2005)
at net.minecraft.class_757.method_3188(class_757.java:1569)
at net.minecraft.class_757.method_3192(class_757.java:1154)
at net.minecraft.class_310.method_1523(class_310.java:1112)
at net.minecraft.class_310.method_1514(class_310.java:728)
at net.minecraft.client.main.Main.main(Main.java:217)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:568)
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74)
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)