Bukkit

The game is not start! Arena is full, but dont working. Here is error:

[13:49:19] [Server thread/WARN]: [Paintball] Task #39594 for Paintball v1.3.4 generated an exception
java.lang.NullPointerException
at de.blablubbabc.paintball.Match.updateAllMatchScoreboardTimers(Match.java:460) ~[?:?]
at de.blablubbabc.paintball.Match.access$2(Match.java:449) ~[?:?]
at de.blablubbabc.paintball.Match$1.run(Match.java:182) ~[?:?]
at de.blablubbabc.paintball.utils.Timer$1.run(Timer.java:24) ~[?:?]
at org.bukkit.craftbukkit.v1_8_R2.scheduler.CraftTask.run(CraftTask.java:71) ~[minecraft.jar:git-Spigot-870264a-0a645a2]
at org.bukkit.craftbukkit.v1_8_R2.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350) [minecraft.jar:git-Spigot-870264a-0a645a2]
at net.minecraft.server.v1_8_R2.MinecraftServer.A(MinecraftServer.java:720) [minecraft.jar:git-Spigot-870264a-0a645a2]
at net.minecraft.server.v1_8_R2.DedicatedServer.A(DedicatedServer.java:368) [minecraft.jar:git-Spigot-870264a-0a645a2]
at net.minecraft.server.v1_8_R2.MinecraftServer.z(MinecraftServer.java:651) [minecraft.jar:git-Spigot-870264a-0a645a2]
at net.minecraft.server.v1_8_R2.MinecraftServer.run(MinecraftServer.java:554) [minecraft.jar:git-Spigot-870264a-0a645a2]

You probably have some conflicting plugin running on your server, which removes/resets/uses the player's scoreboards while they are playing paintball?

You can disable paintball's scoreboard feature in the config.