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
+ l$ X  o/ G/ d# x. W% G' A' ZThere was an error in creating a Selector for method step in Class swarm.analysis.EZDistributionImpl.
& [  p; l3 e1 V. [1 Uswarm.analysis.EZDistributionImpl.step returns null
The 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
    while executing
"source F:\Swarm-2.2-java/lib/tcl8.4//word.tcl"
8 `5 v5 [: J/ l3 H# i+ lwhile evaluating: source F:\Swarm-2.2-java/lib/tcl8.4//word.tcl
0 G8 t; @/ @8 X! ]) j*** event raised for warning: WarningMessage
9 t$ t: I- a. f- P0 e' J$ W*** function: _i_ProbeMap__addProbe_(), file: /src/swarm/src/objectbase/ProbeMap.m, line: 606
Attempt to add null probe
*** execution continuing...
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~