voila:
[12:33:15] [Server thread/INFO]: Starting minecraft server version 1.10.2
[12:34:08] [Server thread/INFO]: Loading properties
[12:34:08] [Server thread/INFO]: Default game type: SURVIVAL
[12:34:08] [Server thread/INFO]: Generating keypair
[12:34:08] [Server thread/INFO]: Starting Minecraft server on *:25565
[12:34:08] [Server thread/INFO]: Using default channel type
[12:34:19] [Server thread/INFO]: Preparing level "world"
[12:34:20] [Server thread/INFO]: Preparing start region for level 0
[12:34:20] [Server thread/INFO]: Done (1.636s)! For help, type "help" or "?"
[12:43:49] [User Authenticator #1/INFO]: UUID of player Squarlo is 8af7db94-fd9a-4905-9fa5-c31e1580fbae
[12:43:50] [Server thread/INFO]: Squarlo[/192.168.0.10:54147] logged in with entity id 1 at (-147.66831846764364, 58.0, 139.71867796649428)
[12:43:50] [Server thread/INFO]: Squarlo joined the game
[12:43:50] [Server thread/WARN]: Failed to handle packet for /192.168.0.10:54147
net.minecraft.util.ReportedException: Ticking player
at net.minecraft.entity.player.EntityPlayerMP.func_71127_g(EntityPlayerMP.java:380) ~[lu.class:?]
at net.minecraft.network.NetHandlerPlayServer.func_73660_a(NetHandlerPlayServer.java:162) ~[me.class:?]
at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher$1.func_73660_a(NetworkDispatcher.java:213) ~[NetworkDispatcher$1.class:?]
at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:287) ~[eo.class:?]
at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:180) [md.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:732) [MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:387) [ld.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471) [MinecraftServer.class:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_241]
Caused by: java.lang.NoSuchMethodError: net.minecraft.entity.player.InventoryPlayer.func_70440_f(I)Lnet/minecraft/item/ItemStack;
at com.kashdeya.tinyprogressions.armor.StoneArmor.onArmorTick(StoneArmor.java:43) ~[StoneArmor.class:?]
at net.minecraft.entity.player.InventoryPlayer.func_70429_k(InventoryPlayer.java:353) ~[zr.class:?]
at net.minecraft.entity.player.EntityPlayer.func_70636_d(EntityPlayer.java:510) ~[zs.class:?]
at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:2013) ~[sf.class:?]
at net.minecraft.entity.player.EntityPlayer.func_70071_h_(EntityPlayer.java:233) ~[zs.class:?]
at net.minecraft.entity.player.EntityPlayerMP.func_71127_g(EntityPlayerMP.java:303) ~[lu.class:?]
... 9 more
[12:43:51] [Server thread/INFO]: Squarlo lost connection: TextComponent{text='Internal server error', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}
[12:43:51] [Server thread/INFO]: Squarlo left the game