Minecraft crashes when i click singleplayer

I was playing Minecraft in a singleplayer world and clicked  ESC to change my world difficulty when my power went out.  When I tried to go into singleplayer it crashed as soon as I clicked it

Here is the crash report

Time: 7/29/20 10:09 AMTime: 7/29/20 10:09 AMDescription: mouseClicked event handler
java.lang.OutOfMemoryError: Java heap space at java.util.ArrayList.<init>(ArrayList.java:152) at com.google.common.collect.Lists.newArrayListWithCapacity(Lists.java:190) at lk$1.a(SourceFile:47) at lk$1.b(SourceFile:32) at le.b(SourceFile:471) at le.a(SourceFile:32) at le$1.a(SourceFile:83) at le$1.b(SourceFile:69) at le.b(SourceFile:471) at le.a(SourceFile:32) at le$1.a(SourceFile:83) at le$1.b(SourceFile:69) at le.b(SourceFile:471) at le.a(SourceFile:32) at le$1.a(SourceFile:83) at le$1.b(SourceFile:69) at lo.a(SourceFile:96) at lo.a(SourceFile:63) at lo.a(SourceFile:26) at dae.a(SourceFile:222) at dae$$Lambda$2896/1806847457.apply(Unknown Source) at dae.a(SourceFile:171) at dae.b(SourceFile:150) at duf.a(SourceFile:85) at duf.<init>(SourceFile:77) at duc.b(SourceFile:48) at dqs.b(SourceFile:321) at dlx.a(SourceFile:895) at dqw.e(SourceFile:141) at dqw$$Lambda$2571/803368825.onPress(Unknown Source) at dni.b(SourceFile:33) at dnc.a(SourceFile:16)

A detailed walkthrough of the error, its code path and all known details is as follows:---------------------------------------------------------------------------------------
– Head --Thread: Render threadStacktrace: at java.util.ArrayList.<init>(ArrayList.java:152) at com.google.common.collect.Lists.newArrayListWithCapacity(Lists.java:190) at lk$1.a(SourceFile:47) at lk$1.b(SourceFile:32) at le.b(SourceFile:471) at le.a(SourceFile:32) at le$1.a(SourceFile:83) at le$1.b(SourceFile:69) at le.b(SourceFile:471) at le.a(SourceFile:32) at le$1.a(SourceFile:83) at le$1.b(SourceFile:69) at le.b(SourceFile:471) at le.a(SourceFile:32) at le$1.a(SourceFile:83) at le$1.b(SourceFile:69) at lo.a(SourceFile:96)
– Affected screen --Details: Screen name: dqwStacktrace: at dqs.a(SourceFile:434) at dly.a(SourceFile:92) at dly.c(SourceFile:162) at dly$$Lambda$2884/268499886.run(Unknown Source) at amn.execute(SourceFile:94) at dly.b(SourceFile:162) at dly$$Lambda$2230/1276687410.invoke(Unknown Source) at org.lwjgl.glfw.GLFWMouseButtonCallbackI.callback(GLFWMouseButtonCallbackI.java:36) at org.lwjgl.system.JNI.invokeV(Native Method) at org.lwjgl.glfw.GLFW.glfwPollEvents(GLFW.java:3101) at com.mojang.blaze3d.systems.RenderSystem.flipFrame(SourceFile:109) at dgy.e(SourceFile:308) at dlx.e(SourceFile:1041) at dlx.e(SourceFile:654) at net.minecraft.client.main.Main.main(SourceFile:215)
– System Details --Details: Minecraft Version: 1.16.1 Minecraft Version ID: 1.16.1 Operating System: Windows 10 (amd64) version 10.0 Java Version: 1.8.0_51, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 547582896 bytes (522 MB) / 771751936 bytes (736 MB) up to 2147483648 bytes (2048 MB) CPUs: 4 JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M Launched Version: 1.16.1 Backend library: LWJGL version 3.2.2 build 10 Backend API: Radeon Pro 570 GL version 4.5.13468 Compatibility Profile Context 21.19.512.1, ATI Technologies Inc. GL Caps: Using framebuffer using OpenGL 3.0 Using VBOs: Yes Is Modded: Probably not. Jar signature remains and client brand is untouched. Type: Client (map_client.txt) Resource Packs:  Current Language: English (US) CPU: 4x Intel(R) Core(TM) i5-7500 CPU @ 3.40GHz