exception in phase 'semantic analysis' in source unit '_BuildScript_' Unsupported class file major version 68

[TrueFaxx]

when building i get this error:
[erl@archlinux BlackOut-main]$ ./gradlew buildJar
WARNING: A restricted method in java.lang.System has been called
WARNING: java.lang.System::load has been called by net.rubygrapefruit.platform.internal.NativeLibraryLoader in an unnamed module (file:/home/erl/.gradle/wrapper/dists/gradle-8.11-bin/c4te04g51qsyw1bxcb929u7br/gradle-8.11/lib/native-platform-0.22-milestone-26.jar)
WARNING: Use --enable-native-access=ALL-UNNAMED to avoid a warning for callers in this module
WARNING: Restricted methods will be blocked in a future release unless native access is enabled

FAILURE: Build failed with an exception.

• What went wrong:
  BUG! exception in phase 'semantic analysis' in source unit 'BuildScript' Unsupported class file major version 68

Unsupported class file major version 68

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BUILD FAILED in 1s

[TrueFaxx]

it was like gradle or java version