trade error

[21:13:12 INFO]: TheOnlyRealTGS issued server command: /trade accept
[21:13:15 WARN]: [Trade] Task #5 for Trade v1.0 generated an exception
java.lang.IllegalArgumentException: Cannot measure distance between Lobby and te
st
        at org.bukkit.Location.distanceSquared(Location.java:451) ~[custom.jar:g
it-Spigot-13716d9-0e2396c]
        at de.matzefratze123.trade.MoveCheckerRunnable.run(MoveCheckerRunnable.j
ava:49) ~[?:?]
        at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftTask.run(CraftTask.java
:71) ~[custom.jar:git-Spigot-13716d9-0e2396c]
        at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftScheduler.mainThreadHea
rtbeat(CraftScheduler.java:350) [custom.jar:git-Spigot-13716d9-0e2396c]
        at net.minecraft.server.v1_8_R1.MinecraftServer.z(MinecraftServer.java:6
94) [custom.jar:git-Spigot-13716d9-0e2396c]
        at net.minecraft.server.v1_8_R1.DedicatedServer.z(DedicatedServer.java:3
16) [custom.jar:git-Spigot-13716d9-0e2396c]
        at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:6
23) [custom.jar:git-Spigot-13716d9-0e2396c]
        at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java
:526) [custom.jar:git-Spigot-13716d9-0e2396c]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_25]
[21:13:16 WARN]: [Trade] Task #5 for Trade v1.0 generated an exception
java.lang.IllegalArgumentException: Cannot measure distance between Lobby and te
st
        at org.bukkit.Location.distanceSquared(Location.java:451) ~[custom.jar:g
it-Spigot-13716d9-0e2396c]
        at de.matzefratze123.trade.MoveCheckerRunnable.run(MoveCheckerRunnable.j
ava:49) ~[?:?]
        at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftTask.run(CraftTask.java
:71) ~[custom.jar:git-Spigot-13716d9-0e2396c]
        at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftScheduler.mainThreadHea
rtbeat(CraftScheduler.java:350) [custom.jar:git-Spigot-13716d9-0e2396c]
        at net.minecraft.server.v1_8_R1.MinecraftServer.z(MinecraftServer.java:6
94) [custom.jar:git-Spigot-13716d9-0e2396c]
        at net.minecraft.server.v1_8_R1.DedicatedServer.z(DedicatedServer.java:3
16) [custom.jar:git-Spigot-13716d9-0e2396c]
        at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:6
23) [custom.jar:git-Spigot-13716d9-0e2396c]
        at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java
:526) [custom.jar:git-Spigot-13716d9-0e2396c]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_25]