ok i definitely need to turn off the vanilla server lol

[16:05:51] [main/FATAL] [minecraft/Main]: Failed to start the minecraft server
net.minecraft.server.SessionLockManager$AlreadyLockedException: /usr/local/minecraft-server/./world/session.lock: already locked (possibly by other Minecraft instance?)
        at net.minecraft.server.SessionLockManager$AlreadyLockedException.func_233000_a_(SourceFile:98) ~[?:?] {re:classloading}
        at net.minecraft.server.SessionLockManager.func_232998_a_(SourceFile:44) ~[?:?] {re:classloading}
        at net.minecraft.world.storage.SaveFormat$LevelSave.<init>(SaveFormat.java:277) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
        at net.minecraft.world.storage.SaveFormat.func_237274_c_(SaveFormat.java:265) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
        at net.minecraft.server.Main.main(Main.java:116) ~[?:?] {re:classloading}
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_275] {}
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_275] {}
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_275] {}
        at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_275] {}
        at net.minecraftforge.fml.loading.FMLServerLaunchProvider.lambda$launchService$0(FMLServerLaunchProvider.java:51) ~[forge-1.16.4-35.1.28.jar:35.1] {}
        at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-8.0.6.jar:?] {}
        at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-8.0.6.jar:?] {}
        at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-8.0.6.jar:?] {}
        at cpw.mods.modlauncher.Launcher.run(Launcher.java:82) [modlauncher-8.0.6.jar:?] {}
        at cpw.mods.modlauncher.Launcher.main(Launcher.java:66) [modlauncher-8.0.6.jar:?] {}
        at net.minecraftforge.server.ServerMain$Runner.runLauncher(ServerMain.java:63) [forge-1.16.4-35.1.28.jar:?] {}
        at net.minecraftforge.server.ServerMain$Runner.access$100(ServerMain.java:60) [forge-1.16.4-35.1.28.jar:?] {}
        at net.minecraftforge.server.ServerMain.main(ServerMain.java:57) [forge-1.16.4-35.1.28.jar:?] {}