Logfile copied from MC-130501. That may be one or three different issues:
[0601/004749:INFO:GameCallbacks.cpp(178)] game/xo (Client thread) error Something went wrong upgrading!
java.lang.IllegalArgumentException: Couldn't upcast
...
[0601/004751:INFO:GameCallbacks.cpp(178)] game/agd (Client thread) warn Unsupported key: Mob in TaggedChoiceType
...
[0601/004751:INFO:GameCallbacks.cpp(178)] game/xo (Client thread) error Something went wrong upgrading!
java.lang.IllegalStateException: Could not parse new entity
Details:
[0601/004749:INFO:GameCallbacks.cpp(178)] game/xo (Client thread) error Something went wrong upgrading!
java.lang.IllegalArgumentException: Couldn't upcast
at xz.g(SourceFile:57)
at xz$$Lambda$835/365193520.get(Unknown Source)
at java.util.Optional.orElseThrow(Optional.java:290)
at xz.a(SourceFile:56)
at xy.a(SourceFile:43)
at zy.a(SourceFile:57)
at zy$$Lambda$578/141263978.apply(Unknown Source)
at xk.a(SourceFile:63)
...
at java.util.Optional.map(Optional.java:215)
at afa.a(SourceFile:123)
at afa$$Lambda$601/1686232293.apply(Unknown Source)
at java.util.Optional.flatMap(Optional.java:241)
at afa.a(SourceFile:122)
at xo.a(SourceFile:37)
at xn.a(SourceFile:18)
at xn.a(SourceFile:9)
at cex.a(SourceFile:94)
at cex.c(SourceFile:76)
at ceu.b(SourceFile:67)
at cpf.g(SourceFile:35)
at cpf.<init>(SourceFile:27)
at cpd.c(SourceFile:48)
at cmf.a(SourceFile:311)
at cio.a(SourceFile:727)
at cmk$4.a(SourceFile:222)
at cjp.mouseClicked(SourceFile:103)
at ckl.mouseClicked(SourceFile:45)
at cmk.mouseClicked(SourceFile:506)
at ciq.b(SourceFile:67)
at ciq$$Lambda$756/799546147.run(Unknown Source)
at cmf.a(SourceFile:429)
at ciq.a(SourceFile:67)
at ciq$$Lambda$678/249483336.invoke(Unknown Source)
at org.lwjgl.glfw.GLFWMouseButtonCallbackI.callback(GLFWMouseButtonCallbackI.java:23)
at org.lwjgl.system.JNI.invokeV(Native Method)
at org.lwjgl.glfw.GLFW.glfwWaitEventsTimeout(GLFW.java:2599)
at ciy.a(SourceFile:298)
at cio.c(SourceFile:844)
at cio.a(SourceFile:380)
at net.minecraft.client.main.Main.main(SourceFile:144)
[id, Minecart -> ((Tag["DisplayTile", NamedType["block_name", (Int | NamespacedString)]] | NilDrop), ((Tag["Items", List[MuType[V105_3]]] | NilDrop), NilSave)),
MinecartChest -> ((Tag["DisplayTile", NamedType["block_name", (Int | NamespacedString)]] | NilDrop), ((Tag["Items", List[MuType[V105_3]]] | NilDrop), NilSave)),
SpectralArrow -> ((Tag["inTile", NamedType["block_name", (Int | NamespacedString)]] | NilDrop), NilSave),
EyeOfEnderSignal -> NilSave,
ItemFrame -> ((Tag["Item", MuType[V105_3]] | NilDrop), NilSave),
MinecartCommandBlock -> ((Tag["DisplayTile", NamedType["block_name", (Int | NamespacedString)]] | NilDrop), NilSave),
Item -> ((Tag["Item", MuType[V105_3]] | NilDrop), NilSave),
EntityHorse -> ((Tag["Items", List[MuType[V105_3]]] | NilDrop), ((Tag["ArmorItem", MuType[V105_3]] | NilDrop), ((Tag["SaddleItem", MuType[V105_3]] | NilDrop), ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave))))),
Fireball -> ((Tag["inTile", NamedType["block_name", (Int | NamespacedString)]] | NilDrop), NilSave),
EnderDragon -> ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)),
MinecartTNT -> ((Tag["DisplayTile", NamedType["block_name", (Int | NamespacedString)]] | NilDrop), NilSave),
Villager -> ((Tag["Inventory", List[MuType[V105_3]]] | NilDrop), ((Tag["Offers", ((Tag["Recipes", List[((Tag["buy", MuType[V105_3]] | NilDrop), ((Tag["buyB", MuType[V105_3]] | NilDrop), ((Tag["sell", MuType[V105_3]] | NilDrop), NilSave)))]] | NilDrop), NilSave)] | NilDrop), ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)))),
ThrownPotion -> ((Tag["inTile", NamedType["block_name", (Int | NamespacedString)]] | NilDrop), ((Tag["Potion", MuType[V105_3]] | NilDrop), NilSave)),
Guardian -> ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)),
SnowMan -> ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)),
LeashKnot -> NilSave,
Arrow -> ((Tag["inTile", NamedType["block_name", (Int | NamespacedString)]] | NilDrop), NilSave),
MushroomCow -> ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)),
LavaSlime -> ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)),
Zombie -> ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)),
MinecartSpawner -> ((Tag["DisplayTile", NamedType["block_name", (Int | NamespacedString)]] | NilDrop), MuType[V105_4]),
EnderCrystal -> NilSave,
Snowball -> ((Tag["inTile", NamedType["block_name", (Int | NamespacedString)]] | NilDrop), NilSave),
Enderman -> ((Tag["carried", NamedType["block_name", (Int | NamespacedString)]] | NilDrop), ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave))),
CaveSpider -> ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)),
MinecartHopper -> ((Tag["DisplayTile", NamedType["block_name", (Int | NamespacedString)]] | NilDrop), ((Tag["Items", List[MuType[V105_3]]] | NilDrop), NilSave)),
XPOrb -> NilSave,
ThrownExpBottle -> ((Tag["inTile", NamedType["block_name", (Int | NamespacedString)]] | NilDrop), NilSave),
FireworksRocketEntity -> ((Tag["FireworksItem", MuType[V105_3]] | NilDrop), NilSave),
Chicken -> ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)),
FallingSand -> ((Tag["Block", NamedType["block_name", (Int | NamespacedString)]] | NilDrop), ((Tag["TileEntityData", MuType[V105_0]] | NilDrop), NilSave)),
Giant -> ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)),
VillagerGolem -> ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)),
PrimedTnt -> NilSave,
Endermite -> ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)),
Creeper -> ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)),
Rabbit -> ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)),
ThrownEnderpearl -> ((Tag["inTile", NamedType["block_name", (Int | NamespacedString)]] | NilDrop), NilSave),
Silverfish -> ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)),
ShulkerBullet -> NilSave,
Shulker -> ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)),
TippedArrow -> ((Tag["inTile", NamedType["block_name", (Int | NamespacedString)]] | NilDrop), NilSave),
ArmorStand -> ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)),
Squid -> ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)),
Skeleton -> ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)),
SmallFireball -> ((Tag["inTile", NamedType["block_name", (Int | NamespacedString)]] | NilDrop), NilSave),
MinecartRideable -> ((Tag["DisplayTile", NamedType["block_name", (Int | NamespacedString)]] | NilDrop), NilSave),
Wolf -> ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)),
Witch -> ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)),
Ozelot -> ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)),
ThrownEgg -> ((Tag["inTile", NamedType["block_name", (Int | NamespacedString)]] | NilDrop), NilSave),
Cow -> ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)),
Slime -> ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)),
AreaEffectCloud -> NilSave,
Painting -> NilSave,
Pig -> ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)),
MinecartFurnace -> ((Tag["DisplayTile", NamedType["block_name", (Int | NamespacedString)]] | NilDrop), NilSave),
Bat -> ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)),
Blaze -> ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)),
WitherBoss -> ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)),
PigZombie -> ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)),
Spider -> ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)),
Ghast -> ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)),
Sheep -> ((Tag["ArmorItems", List[MuType[V105_3]]] | NilDrop), ((Tag["HandItems", List[MuType[V105_3]]] | NilDrop), NilSave)),
WitherSkull -> ((Tag["inTile", NamedType["block_name", (Int | NamespacedString)]] | NilDrop), NilSave),
Boat -> NilSave]
[0601/004751:INFO:GameCallbacks.cpp(178)] game/xo (Client thread) error Something went wrong upgrading!
java.lang.IllegalStateException: Could not parse new entity
at zz.f(SourceFile:139)
at zz$$Lambda$890/246994233.get(Unknown Source)
at java.util.Optional.orElseThrow(Optional.java:290)
at zz.a(SourceFile:139)
...
at aav.b(SourceFile:26)
at abd$$Lambda$630/2020226167.apply(Unknown Source)
at afa.a(SourceFile:133)
at afa.a(SourceFile:124)
at afa$$Lambda$623/262926126.apply(Unknown Source)
at java.util.Optional.map(Optional.java:215)
at afa.a(SourceFile:123)
at afa$$Lambda$601/1686232293.apply(Unknown Source)
at java.util.Optional.flatMap(Optional.java:241)
at afa.a(SourceFile:122)
at xo.a(SourceFile:37)
at xn.a(SourceFile:18)
at xn.a(SourceFile:9)
at cex.a(SourceFile:94)
at cex.c(SourceFile:76)
at ceu.b(SourceFile:67)
at cpf.g(SourceFile:35)
at cpf.<init>(SourceFile:27)
at cpd.c(SourceFile:48)
at cmf.a(SourceFile:311)
at cio.a(SourceFile:727)
at cmk$4.a(SourceFile:222)
at cjp.mouseClicked(SourceFile:103)
at ckl.mouseClicked(SourceFile:45)
at cmk.mouseClicked(SourceFile:506)
at ciq.b(SourceFile:67)
at ciq$$Lambda$756/799546147.run(Unknown Source)
at cmf.a(SourceFile:429)
at ciq.a(SourceFile:67)
at ciq$$Lambda$678/249483336.invoke(Unknown Source)
at org.lwjgl.glfw.GLFWMouseButtonCallbackI.callback(GLFWMouseButtonCallbackI.java:23)
at org.lwjgl.system.JNI.invokeV(Native Method)
at org.lwjgl.glfw.GLFW.glfwWaitEventsTimeout(GLFW.java:2599)
at ciy.a(SourceFile:298)
at cio.c(SourceFile:844)
at cio.a(SourceFile:380)
at net.minecraft.client.main.Main.main(SourceFile:144)
Linked issues
relates to 2
Attachments
Comments 1

Is this still an issue in the most recent versions (currently that is 1.13.2, or the latest snapshot 19w12b) of Minecraft? If so, please update the affected versions and help us keeping this ticket updated from time to time. If you are the owner/reporter of this ticket, you can modify the affected version(s) yourself.