[1.12.2] Failed to load class "org.slf4j.impl.StaticMDCBinder"

[speccycy]

Environment

Minecraft version(1.12.2/1.16.5/1.18.2): 1.12.2 Build version(Get from /version command): git-CatServer-1.12.2-6eb82ffe Mods/Plugins: Logger-1.8

Describe the bug (If there is an error, please attach the pastebin link) Logger Plugin not working

[11:17:57] [Server thread/INFO] [me.prism3.logger.Main]: [Logger] Enabling Logger v1.8
[11:17:59] [Server thread/WARN] []: SLF4J: Failed to load class "org.slf4j.impl.StaticMDCBinder".
[11:17:59] [Server thread/WARN] []: SLF4J: Defaulting to no-operation MDCAdapter implementation.
[11:17:59] [Server thread/WARN] []: SLF4J: See http://www.slf4j.org/codes.html#no_static_mdc_binder for further details.
[11:18:01] [Server thread/ERROR] [Minecraft]: Error occurred while enabling Logger v1.8 (Is it up to date?)
java.lang.NullPointerException: null
    at java.util.Objects.requireNonNull(Objects.java:203) ~[?:1.8.0_332]
    at me.prism3.logger.utils.FileHandler.deleteFiles(FileHandler.java:801) ~[?:?]
    at me.prism3.logger.Main.onEnable(Main.java:74) ~[?:?]
    at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:264) ~[JavaPlugin.class:git-CatServer-1.12.2-6eb82ffe]
    at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:328) [JavaPluginLoader.class:git-CatServer-1.12.2-6eb82ffe]
    at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405) [SimplePluginManager.class:git-CatServer-1.12.2-6eb82ffe]
    at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugin(CraftServer.java:438) [CraftServer.class:git-CatServer-1.12.2-6eb82ffe]
    at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugins(CraftServer.java:384) [CraftServer.class:git-CatServer-1.12.2-6eb82ffe]
    at net.minecraft.server.MinecraftServer.loadAllWorlds(MinecraftServer.java:383) [MinecraftServer.class:?]
    at net.minecraft.server.dedicated.DedicatedServer.init(DedicatedServer.java:330) [nz.class:?]
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:642) [MinecraftServer.class:?]
    at java.lang.Thread.run(Thread.java:750) [?:1.8.0_332]

Expected behavior

To Reproduce

Screenshot/Video (If it doesn't exist you can ignore it)