Stacktrace:
at net.minecraft.util.ResourceLocation.func_177516_a(SourceFile:30)
at net.minecraft.util.ResourceLocation.<init>(SourceFile:21)
at net.darkhax.gyth.api.GythApi.getTier(GythApi.java:123)
at net.darkhax.gyth.tileentity.TileEntityModularTank.getTier(TileEntityModularTank.java:64)
at net.darkhax.gyth.blocks.BlockTank.getExtendedState(BlockTank.java:104)
http://pastebin.com/mEZKk6K3