求问关于Swarm产生柱状图的问题 多谢大家了！！

mushroom89

各位好，我想请教一下，我想产生一个柱状图，但是在buildActions（）好像selector那有问题，说
& q" X" }3 }1 ^9 x% ]. N$ }! \There was an error in creating a Selector for method step in Class swarm.analysis.EZDistributionImpl.
swarm.analysis.EZDistributionImpl.step returns null
; r/ A. k) K1 a. `2 x, jThe process will be terminated.
(Tcl -eval couldn't read file "F:Swarm-2.2-java/lib/tcl8.4//word.tcl": no such file or directory
5 \' S6 u2 y- W- ^7 N  k* i3 }    while executing
. F: N0 i: ~+ ^: P1 `  @& J"source F:\Swarm-2.2-java/lib/tcl8.4//word.tcl"
while evaluating: source F:\Swarm-2.2-java/lib/tcl8.4//word.tcl
. F9 z$ @2 f9 N0 G3 L& p5 y# L7 v2 ~*** event raised for warning: WarningMessage
. d% v0 \3 Q5 V*** function: _i_ProbeMap__addProbe_(), file: /src/swarm/src/objectbase/ProbeMap.m, line: 606
Attempt to add null probe
*** execution continuing...
/ k/ s; e. V8 T& u) H; w请问第一个参数应该是什么呢 我设的是ezdist（一个EZDistribution object），
请问是怎么回事呢？多谢大家了~