Stuck installing server pack

I was following a rlcraft server creating tutorial, and when I go to install forge it begins to unpack a file but never finishes.

I have tried updating java but that didn't work.

I inserted the error log below.

any help that could be given would be much appreciated, thanks.

java.net.preferIPv4Stack=true
Considering library net.minecraftforge:forge:1.12.2-14.23.5.2847: Not Downloading {Wrong Side}
Considering library net.minecraft:launchwrapper:1.12
Considering library org.ow2.asm:asm-all:5.2
Considering library org.jline:jline:3.5.1
Considering library net.java.dev.jna:jna:4.4.0
Considering library com.typesafe.akka:akka-actor_2.11:2.3.3
Checking "C:\Users\Joel Danielewicz\OneDrive\Desktop\RLCraft+Server+Pack+1.12.2+-+Beta+v2.8.1\libraries\com\typesafe\akka\akka-actor_2.11\2.3.3\akka-actor_2.11-2.3.3.jar" internal checksums
    checksums.sha1 was not found, validation failed
Downloading library com.typesafe.akka:akka-actor_2.11:2.3.3
Unpacking packed file akka-actor_2.11-2.3.3.jar.pack.xz
  Signed
  Checksum Length: 140942
  Total Length:    2606968
  Temp File:       C:\Users\JOELDA~1\AppData\Local\Temp\art13163380432978303022.pack
Exception in thread "main" java.lang.reflect.InvocationTargetException
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:564)
	at net.minecraftforge.installer.Java6Gate.main(Java6Gate.java:48)
Caused by: java.lang.NoClassDefFoundError: java/util/jar/Pack200
	at net.minecraftforge.installer.DownloadUtils.unpackLibrary(DownloadUtils.java:253)
	at net.minecraftforge.installer.DownloadUtils.downloadInstalledLibraries(DownloadUtils.java:89)
	at net.minecraftforge.installer.ServerInstall.run(ServerInstall.java:71)
	at net.minecraftforge.installer.InstallerAction.run(InstallerAction.java:43)
	at net.minecraftforge.installer.InstallerPanel.run(InstallerPanel.java:406)
	at net.minecraftforge.installer.SimpleInstaller.launchGui(SimpleInstaller.java:168)
	at net.minecraftforge.installer.SimpleInstaller.main(SimpleInstaller.java:54)
	... 5 more
Caused by: java.lang.ClassNotFoundException: java.util.jar.Pack200
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:602)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
	... 12 more