Tried to use 1.11.2 Spigot and it shows same bug with this one (I tried CraftBukkit 1.7.10)
[BlockParty] Task #2 for BlockParty v2.9 generated an exception
java.lang.NoClassDefFoundError: com/google/gson/JsonElement
at net.cookiegames.bp.counter.LobbyCounter$2.run(LobbyCounter.java:89) ~[?:?]
at org.bukkit.craftbukkit.v1_7_R4.scheduler.CraftTask.run(CraftTask.java:53) ~[spigot.jar:git-Bukkit-1.7.9-R0.2-20-g0b2ed13-b3108jnks]
at org.bukkit.craftbukkit.v1_7_R4.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:349) [spigot.jar:git-Bukkit-1.7.9-R0.2-20-g0b2ed13-b3108jnks]
at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:600) [spigot.jar:git-Bukkit-1.7.9-R0.2-20-g0b2ed13-b3108jnks]
at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:258) [spigot.jar:git-Bukkit-1.7.9-R0.2-20-g0b2ed13-b3108jnks]
at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:558) [spigot.jar:git-Bukkit-1.7.9-R0.2-20-g0b2ed13-b3108jnks]
at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:469) [spigot.jar:git-Bukkit-1.7.9-R0.2-20-g0b2ed13-b3108jnks]
at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [spigot.jar:git-Bukkit-1.7.9-R0.2-20-g0b2ed13-b3108jnks]
Caused by: java.lang.ClassNotFoundException: com.google.gson.JsonElement
at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_151]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:77) ~[spigot.jar:git-Bukkit-1.7.9-R0.2-20-g0b2ed13-b3108jnks]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:62) ~[spigot.jar:git-Bukkit-1.7.9-R0.2-20-g0b2ed13-b3108jnks]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_151]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_151]
... 8 more
