R help - Jan 2012 - Package: Waveslim Error: The object is this type is not subsettable

Hi everyone 

I am using the wavelet and waveslim package in R to find the wave
variance.Here is the code 

return.modwt<-modwt(X, filter="la8", n.levels=5,
boundary="periodic",
fast=TRUE) 
return.modwt.var<- wave.variance(return.modwt, type="nongaussian") 

Where X is a uni-variate time series.

I am expecting a matrix with 5 rows(no. of levels) and 3
columns(variance,upper bound,lower bound) but I am getting a message: no
method for coercing this S4 class to a vector. 
What does this mean?I have installed waveslim 1.6.4 version.

Thanks in Advance!

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