Compiled for Java 8 but crashing on it

Since 1.0.2, the mod is targeting Java 8, it runs well on Java 17, but crash on Java 8. In my case, I'm using Fabric Loader 0.14.21.
ScriptEngineManager providers.next(): javax.script.ScriptEngineFactory: Provider jdk.nashorn.api.scripting.NashornScriptEngineFactory not found
[22:19:14] [main/INFO]: Loading Minecraft 1.13.2 with Fabric Loader 0.14.21
[22:19:14] [main/INFO]: Loading 6 mods:
    - fabricloader 0.14.21
    - java 8
    - minecraft 1.13.2
    - mod-loading-screen 1.0.2
       |-- com_formdev_flatlaf 3.0
       \-- net_lenni0451_reflect 1.0.2
[ModLoadingScreen] I just want to say... I'm loading *really* early.
[ModLoadingScreen] Opening loading screen
Exception caught from launcher
java.lang.Error: java.lang.RuntimeException: Unable to invoke method startLoadingScreen
    at io.github.gaming32.modloadingscreen.ModLoadingScreen.<clinit>(ModLoadingScreen.java:200)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:348)
    at net.fabricmc.loader.impl.FabricLoaderImpl.setupLanguageAdapters(FabricLoaderImpl.java:439)
    at net.fabricmc.loader.impl.FabricLoaderImpl.finishModLoading(FabricLoaderImpl.java:349)
    at net.fabricmc.loader.impl.FabricLoaderImpl.freeze(FabricLoaderImpl.java:112)
    at net.fabricmc.loader.impl.launch.knot.Knot.init(Knot.java:149)
    at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:68)
    at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)
    at org.prismlauncher.launcher.impl.StandardLauncher.launch(StandardLauncher.java:88)
    at org.prismlauncher.EntryPoint.listen(EntryPoint.java:126)
    at org.prismlauncher.EntryPoint.main(EntryPoint.java:71)
Caused by: java.lang.RuntimeException: Unable to invoke method startLoadingScreen
    at net.lenni0451.reflect.Methods.invoke(Methods.java:53)
    at io.github.gaming32.modloadingscreen.ModLoadingScreen.init(ModLoadingScreen.java:65)
    at io.github.gaming32.modloadingscreen.ModLoadingScreen.<clinit>(ModLoadingScreen.java:198)
    ... 11 more
Caused by: java.lang.NoClassDefFoundError: com/formdev/flatlaf/FlatDarkLaf
    at io.github.gaming32.modloadingscreen.ActualLoadingScreen.startLoadingScreen(ActualLoadingScreen.java:129)
    at java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:627)
    at net.lenni0451.reflect.Methods.invoke(Methods.java:50)
    ... 13 more
Caused by: java.lang.ClassNotFoundException: com.formdev.flatlaf.FlatDarkLaf
    at java.net.URLClassLoader.findClass(URLClassLoader.java:387)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
    ... 16 more
Exiting with ERROR
Process exited with code 2.
Gaming32 / mod-loading-screen

Compiled for Java 8 but crashing on it #16
