chopniak script help

i've been using chopniak for a while and I've had the same problem with it more than a few times, when i log in it never gets past the welcome screen and displays this message:

[03:12:26][ Chopniak] java.lang.NullPointerException
at com.speljohan.rsbot.script.Calculations.worldToMinimap(Calculations.java:107)
at com.speljohan.rsbot.script.Methods.worldToMinimap(Methods.java:2148)
at com.speljohan.rsbot.script.Methods.tileToMinimap(Methods.java:632)
at com.speljohan.rsbot.script.Methods.walkTileMM(Methods.java:401)
at Chopniak.loop(Chopniak.java:424)
at com.speljohan.rsbot.script.Script.run(Script.java:102)
at com.speljohan.rsbot.script.ScriptHandler$1.run(ScriptHandler.java:70)
at java.lang.Thread.run(Unknown Source)
any help? thanks