I can't create a world

13 actionable tasks: 10 executed, 3 up-to-date
C:\Users\Clency\MCreatorWorkspaces\.mcreator>
Task completed with return code 0 in 438182 milliseconds
20:32.13 [Server thread/INFO] [minecraft/IntegratedServer]: Starting integrated minecraft server version 1.12.2
20:32.13 [Server thread/INFO] [minecraft/IntegratedServer]: Generating keypair
20:32.13 [Server thread/INFO] [FML]: Injecting existing registry data into this server instance
20:32.14 [Server thread/INFO] [FML]: Applying holder lookups
20:32.14 [Server thread/INFO] [FML]: Holder lookups applied
20:32.14 [Server thread/INFO] [FML]: Loading dimension 0 (Elemental Masters) (net.minecraft.server.integrated.IntegratedServer@31086047)
20:32.15 [Server thread/ERROR] [FML]: Parsing error loading built-in advancement elemental_masters:icelavaachievement
com.google.gson.JsonSyntaxException: Expected item to be an item, was unknown string 'minecraft:frosted_ice'
   at net.minecraft.util.JsonUtils.getItem(JsonUtils.java:133 ) ~[JsonUtils.class:?]
   at net.minecraft.util.JsonUtils.getItem(JsonUtils.java:150 ) ~[JsonUtils.class:?]
   at net.minecraft.advancements.DisplayInfo.deserializeIcon(DisplayInfo.java:133 ) ~[DisplayInfo.class:?]
   at net.minecraft.advancements.DisplayInfo.deserialize(DisplayInfo.java:111 ) ~[DisplayInfo.class:?]
   at net.minecraft.advancements.Advancement$Builder.deserialize(Advancement.java:294 ) ~[Advancement$Builder.class:?]
   at net.minecraft.advancements.AdvancementManager$1.deserialize(AdvancementManager.java:50 ) ~[AdvancementManager$1.class:?]
   at net.minecraft.advancements.AdvancementManager$1.deserialize(AdvancementManager.java:46 ) ~[AdvancementManager$1.class:?]
   at com.google.gson.internal.bind.TreeTypeAdapter.read(TreeTypeAdapter.java:69 ) ~[TreeTypeAdapter.class:?]
   at net.minecraft.util.JsonUtils.gsonDeserialize(JsonUtils.java:435 ) ~[JsonUtils.class:?]
   at net.minecraft.util.JsonUtils.fromJson(JsonUtils.java:485 ) ~[JsonUtils.class:?]
   at net.minecraftforge.common.ForgeHooks.lambda$loadAdvancements$0(ForgeHooks.java:1356 ) ~[ForgeHooks.class:?]
   at net.minecraftforge.common.crafting.CraftingHelper.findFiles(CraftingHelper.java:822 ) [CraftingHelper.class:?]
   at net.minecraftforge.common.ForgeHooks.loadAdvancements(ForgeHooks.java:1338 ) [ForgeHooks.class:?]
   at net.minecraftforge.common.ForgeHooks.loadAdvancements(ForgeHooks.java:1312 ) [ForgeHooks.class:?]
   at net.minecraft.advancements.AdvancementManager.reload(AdvancementManager.java:70 ) [AdvancementManager.class:?]
   at net.minecraft.advancements.AdvancementManager.(AdvancementManager.java:61 ) [AdvancementManager.class:?]
   at net.minecraft.world.WorldServer.init(WorldServer.java:162 ) [WorldServer.class:?]
   at net.minecraft.server.integrated.IntegratedServer.loadAllWorlds(IntegratedServer.java:123 ) [IntegratedServer.class:?]
   at net.minecraft.server.integrated.IntegratedServer.init(IntegratedServer.java:160 ) [IntegratedServer.class:?]
   at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:552 ) [MinecraftServer.class:?]
   at java.lang.Thread.run(Thread.java:748 ) [?:1.8.0_212]
20:32.16 [Server thread/ERROR] [minecraft/MinecraftServer]: Encountered an unexpected exception
java.lang.NullPointerException: null
   at net.minecraft.advancements.AdvancementList.loadAdvancements(AdvancementList.java:92 ) ~[AdvancementList.class:?]
   at net.minecraft.advancements.AdvancementManager.reload(AdvancementManager.java:71 ) ~[AdvancementManager.class:?]
   at net.minecraft.advancements.AdvancementManager.(AdvancementManager.java:61 ) ~[AdvancementManager.class:?]
   at net.minecraft.world.WorldServer.init(WorldServer.java:162 ) ~[WorldServer.class:?]
   at net.minecraft.server.integrated.IntegratedServer.loadAllWorlds(IntegratedServer.java:123 ) ~[IntegratedServer.class:?]
   at net.minecraft.server.integrated.IntegratedServer.init(IntegratedServer.java:160 ) ~[IntegratedServer.class:?]
   at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:552 ) [MinecraftServer.class:?]
   at java.lang.Thread.run(Thread.java:748 ) [?:1.8.0_212]
20:32.16 [Server thread/ERROR] [minecraft/MinecraftServer]: This crash report has been saved to: C:\Users\Clency\MCreatorWorkspaces\.mcreator\run\.\crash-reports\crash-2019-06-28_20.32.16-server.txt
20:32.16 [Server thread/INFO] [minecraft/MinecraftServer]: Stopping server
20:32.16 [Server thread/INFO] [minecraft/MinecraftServer]: Saving players
20:32.16 [Server thread/INFO] [minecraft/MinecraftServer]: Saving worlds
20:32.16 [Server thread/INFO] [minecraft/MinecraftServer]: Saving chunks for level 'Elemental Masters'/overworld
20:32.16 [Server thread/INFO] [FML]: Unloading dimension 0
20:32.16 [Server thread/INFO] [FML]: Applying holder lookups
20:32.16 [Server thread/INFO] [FML]: Holder lookups applied
20:32.16 [Server thread/INFO] [FML]: The state engine was in incorrect state SERVER_STARTING and forced into state SERVER_STOPPED. Errors may have been discarded.
20:32.20 [main/INFO] [STDOUT]: [net.minecraft.init.Bootstrap:printToSYSOUT:629 ---- Minecraft Crash Report ----
// Oh - I know what I did wrong!
Time: 6/28/19 8:32 PM
Description: Exception in server tick loop
java.lang.NullPointerException: Exception in server tick loop
   at net.minecraft.advancements.AdvancementList.loadAdvancements(AdvancementList.java:92 )
   at net.minecraft.advancements.AdvancementManager.reload(AdvancementManager.java:71 )
   at net.minecraft.advancements.AdvancementManager.(AdvancementManager.java:61 )
   at net.minecraft.world.WorldServer.init(WorldServer.java:162 )
   at net.minecraft.server.integrated.IntegratedServer.loadAllWorlds(IntegratedServer.java:123 )
   at net.minecraft.server.integrated.IntegratedServer.init(IntegratedServer.java:160 )
   at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:552 )
   at java.lang.Thread.run(Thread.java:748 )
A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- System Details --
Details:
   Minecraft Version: 1.12.2
   Operating System: Windows 10 (amd64) version 10.0
   Java Version: 1.8.0_212, BellSoft
   Java VM Version: LibericaJDK 64-Bit Server VM (mixed mode), 
   Memory: 549488536 bytes (524 MB) / 978321408 bytes (933 MB) up to 1879048192 bytes (1792 MB)
   JVM Flags: 0 total; 
   IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
   FML: MCP 9.42 Powered by Forge 14.23.5.2768 5 mods loaded, 5 mods active
   States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
   | State   | ID                | Version      | Source                           | Signature |
   |:------- |:----------------- |:------------ |:-------------------------------- |:--------- |
   | UCHIJAA | minecraft         | 1.12.2       | minecraft.jar                    | None      |
   | UCHIJAA | mcp               | 9.42         | minecraft.jar                    | None      |
   | UCHIJAA | FML               | 8.0.99.99    | forgeSrc-1.12.2-14.23.5.2768.jar | None      |
   | UCHIJAA | forge             | 14.23.5.2768 | forgeSrc-1.12.2-14.23.5.2768.jar | None      |
   | UCHIJAA | elemental_masters | 2.0.1        | modid-1.0.jar                    | None      |
   Loaded coremods (and transformers): 
   GL info: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.
   Profiler Position: N/A (disabled)
   Player Count: 0 / 8; []
   Type: Integrated Server (map_client.txt)
   Is Modded: Definitely; Client brand changed to 'fml,forge'
20:32.20 [main/INFO] [STDOUT]: [net.minecraft.init.Bootstrap:printToSYSOUT:629 #@!@# Game crashed! Crash report saved to: #@!@# .\crash-reports\crash-2019-06-28_20.32.16-server.txt
20:32.20 [Client Shutdown Thread/INFO] [minecraft/MinecraftServer]: Stopping server
20:32.20 [Client Shutdown Thread/INFO] [minecraft/MinecraftServer]: Saving players
20:32.20 [Client Shutdown Thread/INFO] [minecraft/MinecraftServer]: Saving worlds
AL lib: (EE) alc_cleanup: 1 device not closed
:runClient FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':runClient'.
> Process 'command 'C:\Program Files\Pylo\MCreator\jdk\bin\java.exe'' finished with non-zero exit value -1
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
* Get more help at https://help.gradle.org
BUILD FAILED in 10m 56s
13 actionable tasks: 10 executed, 3 up-to-date
C:\Users\Clency\MCreatorWorkspaces\.mcreator>
Task completed with return code 0 in 657679 milliseconds