readqWig error

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Hi,
I am trying to Run:

data <- readqWig("edited.gz", vp.pos=144450324, window=700e3)

but I am getting the following error:

Error in scan(file, skip = 2, quiet = T) :
scan() expected 'a real', got 'variableStep'

the first line has to be removed
zcat edited.gz | head -5
track type=wiggle_0 name=F_4C_rep2_P3_R1 visibility=full autoScale=off viewLimits=0.0:2500.0 maxHeightPixels=50:50:8 color=0,0,200
priority=10
variableStep chrom=chr1 span=1
3003213 0
3003262 0
3003267 0

but run the code have the same error:

Error in scan(file, skip = 2, quiet = T) :
scan() expected 'a real', got 'variableStep'

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what could be possibly wrong?
Thanks much