포지로 서버 여는것까진 성공했습니다

그후 모드를 넣으면 서버가 열리지않습니다

알렉스몹모드와 한마포 한글채팅모드를 넣을때마다 서버가 열리지않는데 뭐가 문제일까요

저 두 모드를 빼고 다른모드할때는 잘열리고

저 두개의 모드중 1개만넣고해도 안열리는것보면 다른모드와 서버충돌도아니고

많은사람들이쓴모드인거  같던데 모드자체에 문제있는것도 아닌거같은데

20:50:21] [main/WARN] [mixin/]: Error loading class: java/lang/invoke/MethodHandles$Lookup (java.lang.IllegalArgumentException: Unsupported class file major version 64)

[20:50:21] [main/WARN] [mixin/]: Error loading class: java/util/concurrent/Executor (java.lang.IllegalArgumentException: Unsupported class file major version 64)

[20:50:21] [main/WARN] [mixin/]: Error loading class: java/lang/AutoCloseable (java.lang.IllegalArgumentException: Unsupported class file major version 64)

[20:50:21] [main/WARN] [mixin/]: Error loading class: java/lang/AutoCloseable (java.lang.IllegalArgumentException: Unsupported class file major version 64)

[20:50:21] [main/WARN] [mixin/]: Error loading class: java/util/concurrent/Executor (java.lang.IllegalArgumentException: Unsupported class file major version 64)

[20:50:21] [main/WARN] [mixin/]: Error loading class: java/lang/AutoCloseable (java.lang.IllegalArgumentException: Unsupported class file major version 64)

[20:50:21] [main/WARN] [mixin/]: Error loading class: java/lang/AutoCloseable (java.lang.IllegalArgumentException: Unsupported class file major version 64)

[20:50:21] [main/WARN] [mixin/]: Error loading class: java/util/concurrent/Executor (java.lang.IllegalArgumentException: Unsupported class file major version 64)

[20:50:21] [main/WARN] [mixin/]: Error loading class: java/lang/AutoCloseable (java.lang.IllegalArgumentException: Unsupported class file major version 64)

[20:50:21] [main/WARN] [mixin/]: Error loading class: java/lang/AutoCloseable (java.lang.IllegalArgumentException: Unsupported class file major version 64)

[20:50:21] [main/WARN] [mixin/]: Error loading class: java/util/concurrent/Executor (java.lang.IllegalArgumentException: Unsupported class file major version 64)

[20:50:21] [main/WARN] [mixin/]: Error loading class: java/lang/AutoCloseable (java.lang.IllegalArgumentException: Unsupported class file major version 64)

[20:50:21] [main/WARN] [mixin/]: Error loading class: java/lang/AutoCloseable (java.lang.IllegalArgumentException: Unsupported class file major version 64)

Exception in thread "main" java.lang.RuntimeException: java.lang.IllegalArgumentException: Unsupported class file major version 64

        at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:32)

        at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:53)

        at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71)

        at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.Launcher.run(Launcher.java:106)

        at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.Launcher.main(Launcher.java:77)

        at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26)

        at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23)

        at [email protected]/cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:141)

Caused by: java.lang.IllegalArgumentException: Unsupported class file major version 64​​

제가뭐를 못하고있는걸까요

두번째 질문으로는 모드서버에 들어오려면

제가 모드들파일을 친구에게 주고

친구는 포지클라를 설치후

윈도우r  앱데타 .mincraft  들간후 모드파일에 붙여넣기후 접속하면 되는건가요