R help - Jul 2012 - zero dimension error while soft thresholding

powers = c(c(1:12), seq(from = 10, to=20, by=2))
> sft = pickSoftThreshold(datExpr, powerVector = powers, verbose = 5)
 pickSoftThreshold: calculating connectivity for given powers...
   ..working on genes 1 through 1000 of  631066
Error in cor(data, data[, c(startG:endG)], use = "p") :
  'x' has a zero dimension.
In addition: Warning message:
In is.na(cols) : is.na() applied to non-(list or vector) of type 'NULL'

I am getting error as shown above while using the soft thresholding code.
.please help me

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