Aether crashing server

Hi, i recently started a forge server on server.pro and all the mods working except Aether and i don't know why because it did work on the previous hosting website(it was free unlike this).

This is the crash report i'm getting:

---- Minecraft Crash Report ----
// Don't do that.

Time: 1/10/21 1:21 PM
Description: Exception in server tick loop

cpw.mods.fml.common.LoaderException: java.lang.ClassNotFoundException: com.gildedgames.the_aether.Aether
    at cpw.mods.fml.common.LoadController.transition(LoadController.java:163)
    at cpw.mods.fml.common.Loader.loadMods(Loader.java:544)
    at cpw.mods.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:87)
    at cpw.mods.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:314)
    at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:117)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:387)
    at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)
Caused by: java.lang.ClassNotFoundException: com.gildedgames.the_aether.Aether
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at cpw.mods.fml.common.ModClassLoader.loadClass(ModClassLoader.java:58)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Unknown Source)
    at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:440)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)
    at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
    at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
    at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
    at com.google.common.eventbus.EventBus.post(EventBus.java:275)
    at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:212)
    at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:190)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)
    at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
    at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
    at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
    at com.google.common.eventbus.EventBus.post(EventBus.java:275)
    at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:119)
    at cpw.mods.fml.common.Loader.loadMods(Loader.java:513)
    ... 5 more
Caused by: java.lang.UnsupportedClassVersionError: com/gildedgames/the_aether/Aether : Unsupported major.minor version 52.0
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at java.security.SecureClassLoader.defineClass(Unknown Source)
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)
    ... 33 more

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- System Details --
Details:
    Minecraft Version: 1.7.10
    Operating System: Linux (amd64) version 4.15.0-106-generic
    Java Version: 1.7.0_80, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 1091428648 bytes (1040 MB) / 1298661376 bytes (1238 MB) up to 2863661056 bytes (2731 MB)
    JVM Flags: 3 total; -Xms1024M -Xmx3072M -XX:-UsePerfData
    AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
    IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
    FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 10.13.4.1614 14 mods loaded, 14 mods active
    States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
    UC    mcp{9.05} [Minecraft Coder Pack] (minecraft.jar) 
    UC    FML{7.10.99.99} [Forge Mod Loader] (forge-1.7.10-10.13.4.1614-1.7.10-universal.jar) 
    UC    Forge{10.13.4.1614} [Minecraft Forge] (forge-1.7.10-10.13.4.1614-1.7.10-universal.jar) 
    UC    PlayerAPI{1.4} [Player API] (minecraft.jar) 
    UC    SmartCore{1.0.3} [Smart Core] (minecraft.jar) 
    UE    aether_legacy{v1.1.2.1} [The Aether] (aether-1.7.10-v1.1.2.1.jar) 
    UC    ArchimedesShips{1.7.10 v1.7.1} [Archimedes' Ships] (ArchimedesShips-1.7.1.jar) 
    UC    CustomSpawner{3.3.0} [DrZhark's CustomSpawner] (CustomMobSpawner3.3.0.zip) 
    UC    MoCreatures{6.3.1} [DrZhark's Mo'Creatures Mod] (DrZharks MoCreatures Mod v6.3.1.zip) 
    UC    grapplemod{1.7.10-v10} [Grappling hook mod] (grapplemod-1.7.10-v10.jar) 
    UC    ImmersiveEngineering{0.7.7} [Immersive Engineering] (ImmersiveEngineering-0.7.7.jar) 
    UC    cfm{3.4.7} [�9MrCrayfish's Furniture Mod] (MrCrayfishFurnitureModv3.4.7(1.7.10).jar) 
    UC    SmartMoving{15.6} [Smart Moving] (SmartMoving-1.7.10-15.6.jar) 
    UC    SmartRender{2.1} [Smart Render] (SmartRender-1.7.10-2.1.jar) 
    Profiler Position: N/A (disabled)
    Is Modded: Definitely; Server brand changed to 'fml,forge'
    Type: Dedicated Server (map_server.txt)