I got SevTech-Ages installed and when i try to start it up i get this error, and i just don't know what to do.
this is the error i got...:

Java HotSpot(TM) 64-Bit Server VM warning: Ignoring option PermSize; support was removed in 8.0
Exception in thread "main" java.lang.ClassCastException: java.base/jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to java.base/java.net.URLClassLoader
at net.minecraft.launchwrapper.Launch.(Launch.java:34)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

What launcher are you using? Remove any mentions of -XX:PermSize or -XX:MaxPermSize from Java launch arguments and try again.

Thank you for reporting an issue! But as stated in the issue template (which you have ignored and deleted) any issues which don't follow the format will be closed and ignored.

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Thanks again for reporting, and we hope you enjoy the pack!