So... Im trying to launch my forge server (forge-1.11.2-13.20.1.2386) and it works fine really, but when I try to add these mods - Ad Inferos V1.2.6  and Think Big Core V1.6.1 (required for Ad Inferos to work), server keeps crashing! Plz help!
 

⬇️Here is my crash-report⬇️:

 

Description: Exception in server tick loop

net.minecraftforge.fml.common.LoaderExceptionModCrash: Caught exception from §e§k!!§6§k]]§c§kkk§4§lAd Inferos§c§kkk§6§k]]§e§k!! (adinferos)
Caused by: java.lang.NoSuchFieldError: shownTip
    at com.superdextor.adinferos.blocks.BlockHellDoor.<init>(BlockHellDoor.java:23)
    at com.superdextor.adinferos.init.NetherBlocks.<clinit>(NetherBlocks.java:73)
    at com.superdextor.adinferos.AdInferosCore.preInit(AdInferosCore.java:70)
    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 net.minecraftforge.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:647)
    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 net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:253)
    at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:231)
    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 net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:148)
    at net.minecraftforge.fml.common.Loader.preinitializeMods(Loader.java:647)
    at net.minecraftforge.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:100)
    at net.minecraftforge.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:332)
    at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:121)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:442)
    at java.lang.Thread.run(Unknown Source)

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

-- System Details --
Details:
    Minecraft Version: 1.11.2
    Operating System: Windows 10 (amd64) version 10.0
    Java Version: 1.8.0_152, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 4116876072 bytes (3926 MB) / 4277534720 bytes (4079 MB) up to 4277534720 bytes (4079 MB)
    JVM Flags: 7 total; -Xmx4G -Xms4G -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:+CMSIncrementalPacing -XX:ParallelGCThreads=2 -XX:+AggressiveOpts
    IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
    FML: MCP 9.38 Powered by Forge 13.20.1.2386 6 mods loaded, 6 mods active
    States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
    UCH    minecraft{1.11.2} [Minecraft] (minecraft.jar) 
    UCH    mcp{9.19} [Minecraft Coder Pack] (minecraft.jar) 
    UCH    FML{8.0.99.99} [Forge Mod Loader] (forge-1.11.2-13.20.1.2386-universal.jar) 
    UCH    forge{13.20.1.2386} [Minecraft Forge] (forge-1.11.2-13.20.1.2386-universal.jar) 
    UCH    thinkbigcore{1.6.1} [§5§m===§r §e§lThink Big Core §5§m===§r] (Think Big Core V1.6.1 - 1.11.2.jar) 
    UCE    adinferos{1.2.6} [§e§k!!§6§k]]§c§kkk§4§lAd Inferos§c§kkk§6§k]]§e§k!!] (Ad Inferos V1.2.6 - 1.11.2.jar) 
    Loaded coremods (and transformers): 
    Profiler Position: N/A (disabled)
    Is Modded: Definitely; Server brand changed to 'fml,forge'
    Type: Dedicated Server (map_server.txt)

 

Seriosly, I dont know what to do anymore... Im trying to solve this problem for a hour or two plz help!

 

do the mods work in single player?

 

This is an issue with Ad Inferos, make sure you're using the latest version and report it to the author.