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Hello guys, I was trying to play a Snapshot and have this error:

Completely ignored arguments: [--nativeLauncherVersion, 1665]
[22:08:02] [Client thread/INFO]: Setting user: Mancu32
Exception in thread "Client thread" java.lang.OutOfMemoryError: unable to create new native thread
at java.lang.Thread.start0(Native Method)
at java.lang.Thread.start(Thread.java:714)
at java.util.concurrent.CompletableFuture$ThreadPerTaskExecutor.execute(CompletableFuture.java:405)
at java.util.concurrent.CompletableFuture.asyncRunStage(CompletableFuture.java:1632)
at java.util.concurrent.CompletableFuture.runAsync(CompletableFuture.java:1850)
at com.mojang.datafixers.DataFixerBuilder.build(DataFixerBuilder.java:70)
at yy.b(SourceFile:151)
at yy.<clinit>(SourceFile:146)
at ago$a.a(SourceFile:461)
at ago.a(SourceFile:135)
at ago.<clinit>(SourceFile:138)
at fk.w(SourceFile:72)
at fk$$Lambda$22/25705367.get(Unknown Source)
at fk.a(SourceFile:98)
at fk$$Lambda$43/20094719.accept(Unknown Source)
at java.util.LinkedHashMap$LinkedEntrySet.forEach(LinkedHashMap.java:663)
at fk.<clinit>(SourceFile:97)
at qc.b(SourceFile:476)
at cof.<init>(SourceFile:365)
at net.minecraft.client.main.Main.main(SourceFile:154)
[22:08:08] [Thread-4/ERROR]: Unable to build datafixers
java.util.concurrent.CompletionException: java.lang.BootstrapMethodError: call site initialization exception
at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:273) ~[?:1.8.0_51]
at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:280) [?:1.8.0_51]
at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1621) [?:1.8.0_51]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_51]
Caused by: java.lang.BootstrapMethodError: call site initialization exception
at java.lang.invoke.CallSite.makeSite(CallSite.java:341) ~[?:1.8.0_51]
at java.lang.invoke.MethodHandleNatives.linkCallSiteImpl(MethodHandleNatives.java:307) ~[?:1.8.0_51]
at java.lang.invoke.MethodHandleNatives.linkCallSite(MethodHandleNatives.java:297) ~[?:1.8.0_51]
at acl.makeRule(SourceFile:60) ~[18w49a.jar:?]
at com.mojang.datafixers.DataFix.getRule(DataFix.java:97) ~[datafixerupper-1.0.21.jar:?]
at com.mojang.datafixers.DataFixerUpper.lambda$getRule$6(DataFixerUpper.java:136) ~[datafixerupper-1.0.21.jar:?]
at com.mojang.datafixers.DataFixerUpper$$Lambda$486/28836029.apply(Unknown Source) ~[?:?]
at java.util.Map.computeIfAbsent(Map.java:957) ~[?:1.8.0_51]
at it.unimi.dsi.fastutil.longs.Long2ObjectMap.computeIfAbsent(Long2ObjectMap.java:606) ~[fastutil-8.2.1.jar:?]
at it.unimi.dsi.fastutil.longs.Long2ObjectMaps$SynchronizedMap.computeIfAbsent(Long2ObjectMaps.java:530) ~[fastutil-8.2.1.jar:?]
at it.unimi.dsi.fastutil.longs.Long2ObjectMaps$SynchronizedMap.computeIfAbsent(Long2ObjectMaps.java:295) ~[fastutil-8.2.1.jar:?]
at com.mojang.datafixers.DataFixerUpper.getRule(DataFixerUpper.java:131) ~[datafixerupper-1.0.21.jar:?]
at com.mojang.datafixers.DataFixerBuilder.lambda$build$1(DataFixerBuilder.java:72) ~[datafixerupper-1.0.21.jar:?]
at com.mojang.datafixers.DataFixerBuilder$$Lambda$471/8866397.run(Unknown Source) ~[?:?]
at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1618) ~[?:1.8.0_51]
... 1 more
Caused by: java.lang.OutOfMemoryError: Metaspace
at sun.misc.Unsafe.defineAnonymousClass(Native Method) ~[?:1.8.0_51]
at java.lang.invoke.InnerClassLambdaMetafactory.spinInnerClass(InnerClassLambdaMetafactory.java:324) ~[?:1.8.0_51]
at java.lang.invoke.InnerClassLambdaMetafactory.buildCallSite(InnerClassLambdaMetafactory.java:194) ~[?:1.8.0_51]
at java.lang.invoke.LambdaMetafactory.metafactory(LambdaMetafactory.java:304) ~[?:1.8.0_51]
at java.lang.invoke.LambdaForm$DMH/9302811.invokeStatic_L6_L(LambdaForm$DMH) ~[?:?]
at java.lang.invoke.LambdaForm$BMH/21257599.reinvoke(LambdaForm$BMH) ~[?:?]
at java.lang.invoke.LambdaForm$MH/4511389.invoke_MT(LambdaForm$MH) ~[?:?]
at java.lang.invoke.CallSite.makeSite(CallSite.java:302) ~[?:1.8.0_51]
at java.lang.invoke.MethodHandleNatives.linkCallSiteImpl(MethodHandleNatives.java:307) ~[?:1.8.0_51]
at java.lang.invoke.MethodHandleNatives.linkCallSite(MethodHandleNatives.java:297) ~[?:1.8.0_51]
at acl.makeRule(SourceFile:60) ~[18w49a.jar:?]
at com.mojang.datafixers.DataFix.getRule(DataFix.java:97) ~[datafixerupper-1.0.21.jar:?]
at com.mojang.datafixers.DataFixerUpper.lambda$getRule$6(DataFixerUpper.java:136) ~[datafixerupper-1.0.21.jar:?]
at com.mojang.datafixers.DataFixerUpper$$Lambda$486/28836029.apply(Unknown Source) ~[?:?]
at java.util.Map.computeIfAbsent(Map.java:957) ~[?:1.8.0_51]
at it.unimi.dsi.fastutil.longs.Long2ObjectMap.computeIfAbsent(Long2ObjectMap.java:606) ~[fastutil-8.2.1.jar:?]
at it.unimi.dsi.fastutil.longs.Long2ObjectMaps$SynchronizedMap.computeIfAbsent(Long2ObjectMaps.java:530) ~[fastutil-8.2.1.jar:?]
at it.unimi.dsi.fastutil.longs.Long2ObjectMaps$SynchronizedMap.computeIfAbsent(Long2ObjectMaps.java:295) ~[fastutil-8.2.1.jar:?]
at com.mojang.datafixers.DataFixerUpper.getRule(DataFixerUpper.java:131) ~[datafixerupper-1.0.21.jar:?]
at com.mojang.datafixers.DataFixerBuilder.lambda$build$1(DataFixerBuilder.java:72) ~[datafixerupper-1.0.21.jar:?]
at com.mojang.datafixers.DataFixerBuilder$$Lambda$471/8866397.run(Unknown Source) ~[?:?]
at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1618) ~[?:1.8.0_51]
... 1 more
Java HotSpot(TM) Client VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

Why is happening?

See https://bugs.mojang.com/browse/MC-137353