Exception in thread "main" java.lang.IllegalStateException: Current Java is 8 but we require at least 21 at net.minecraf

[mxrshyx]

Trying to start a server. When running run.bat the following pops up
"

Exception in thread "main" java.lang.IllegalStateException: Current Java is 8 but we require at least 21
        at net.minecraftforge.bootstrap.shim.Main.main(Main.java:32)

If you're struggling to fix the error above, ask for help on the forums or Discord mentioned in the readme.
Press any key to continue . . .
"
Any help?

[Ugdhar]

You need to install Java 21.

It tells you how to do it in the FAQ, link is orange banner at top of page that says "Please read..."