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
There was an error in creating a Selector for method step in Class swarm.analysis.EZDistributionImpl.
  T! r1 W3 V/ A# J. F- ]swarm.analysis.EZDistributionImpl.step returns null
+ ^' Z0 c- U+ G' D" EThe 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 n7 x  {2 D9 k  q5 c; N    while executing
"source F:\Swarm-2.2-java/lib/tcl8.4//word.tcl"
while evaluating: source F:\Swarm-2.2-java/lib/tcl8.4//word.tcl
& U0 x) m. i5 E- f1 Q*** event raised for warning: WarningMessage
- x7 k% r+ G% n6 P6 l# ^9 K, l' }*** function: _i_ProbeMap__addProbe_(), file: /src/swarm/src/objectbase/ProbeMap.m, line: 606
: r' K' D) Y- Q7 ?' \% D# Q* X+ W6 FAttempt to add null probe
# U2 A/ X2 K! S0 t: G# t  W/ _*** execution continuing...
1 c- B2 g6 p9 O( N9 @" I' N  }请问第一个参数应该是什么呢 我设的是ezdist（一个EZDistribution object），
: L2 t) n6 w* U1 B- k# R* s# m请问是怎么回事呢？多谢大家了~