so tried getting minecraft forge 1.18.2 and when i press ok it works normally but it says cant find class on a part of the log. It completes saying successfully installed client profile for forge version 1.18.2 to launcher but it isn't in the launcher and isn't in the file versions folder either. Cant find anything online for this. It is a java file and i have an up-to-date version of java. I did install forge 1.19.2 however and that works fine. Shows up on the launcher. Please help, its really frustrating. Not sure what to do. This is a part of the class error that comes up.

Unexpected lack of synthetic args to the constructor: expected [Lnet/minecraft/util/ExtraCodecs;] at the start of <init>(Ljava/util/function/Function;)V in net/minecraft/util/ExtraCodecs$1ContextRetrievalCodec
Cant Find Class: it/unimi/dsi/fastutil/floats/FloatList
Cant Find Class: it/unimi/dsi/fastutil/objects/ObjectArrays
Cant Find Class: org/apache/commons/lang3/math/NumberUtils
Cant Find Class: com/sun/jna/platform/win32/Tlhelp32$MODULEENTRY32W
Cant Find Class: com/sun/jna/platform/win32/Tlhelp32
Cant Find Class: com/mojang/datafixers/DataFix
Cant Find Class: com/google/gson/stream/JsonToken
Cant Find Class: org/jetbrains/annotations/Contract
Cant Find Class: com/mojang/datafixers/TypeRewriteRule
Cant Find Class: com/mojang/datafixers/Typed
Cant Find Class: com/mojang/datafixers/DataFixerBuilder
Cant Find Class: com/sun/jna/Platform
Cant Find Class: it/unimi/dsi/fastutil/floats/FloatArrayList
Cant Find Class: com/sun/jna/platform/win32/Kernel32
Cant Find Class: com/mojang/datafixers/OpticFinder
Cant Find Class: com/mojang/datafixers/types/templates/TaggedChoice$TaggedChoiceType
Cant Find Class: com/sun/jna/platform/win32/Kernel32Util
Cant Find Class: com/mojang/datafixers/types/templates/TaggedChoice
Cant Find Class: com/sun/jna/ptr/IntByReference
Cant Find Class: com/sun/jna/platform/win32/Version
Cant Find Class: com/sun/jna/Native
Cant Find Class: com/mojang/datafixers/types/templates/List$ListType
Cant Find Class: com/mojang/serialization/DynamicLike
Cant Find Class: com/mojang/datafixers/types/templates/List
Cant Find Class: com/sun/jna/platform/win32/Win32Exception
Cant Find Class: com/sun/jna/Memory
Cant Find Class: it/unimi/dsi/fastutil/ints/Int2ObjectLinkedOpenHashMap
Cant Find Class: com/sun/jna/ptr/PointerByReference
Cant Find Class: com/mojang/datafixers/types/templates/Tag$TagType
Cant Find Class: com/mojang/datafixers/types/templates/Tag
Cant Find Class: it/unimi/dsi/fastutil/shorts/ShortArrayList
Cant Find Class: it/unimi/dsi/fastutil/shorts/ShortList
Cant Find Class: it/unimi/dsi/fastutil/ints/Int2IntLinkedOpenHashMap
Cant Find Class: it/unimi/dsi/fastutil/ints/Int2IntMap
Cant Find Class: com/mojang/datafixers/types/templates/CompoundList$CompoundListType
Cant Find Class: com/mojang/datafixers/types/templates/CompoundList
Cant Find Class: it/unimi/dsi/fastutil/ints/Int2IntOpenHashMap
Cant Find Class: it/unimi/dsi/fastutil/ints/IntIterator
Cant Find Class: com/mojang/datafixers/FieldFinder
Cant Find Class: it/unimi/dsi/fastutil/objects/Object2IntArrayMap
Cant Find Class: it/unimi/dsi/fastutil/ints/IntBinaryOperator
Cant Find Class: com/mojang/datafixers/types/templates/Const$PrimitiveType
Cant Find Class: com/mojang/datafixers/types/templates/TypeTemplate
Cant Find Class: com/mojang/datafixers/types/templates/Hook$HookFunction
Cant Find Class: com/mojang/datafixers/types/templates/Hook
Cant Find Class: com/mojang/datafixers/types/templates/Const
Cant Find Class: it/unimi/dsi/fastutil/longs/LongList
Cant Find Class: it/unimi/dsi/fastutil/objects/Object2LongMaps
Cant Find Class: it/unimi/dsi/fastutil/longs/LongArrayList
Cant Find Class: com/google/common/math/Quantiles$ScaleAndIndexes
Cant Find Class: com/google/common/math/Quantiles

 

Please post the installer log which is present in the same folder as the installer JAR.

Thanks for your response but it randomly fixed itself. Not sure why. Thanks tho