This occurs when the peak file in question contains no peaks.
From that vignette (see bold):
The actual reads and peak for this experiment are not included withthis vignette as they are too large. The sample sheet (see below)
include the SRA SRR numbers for each of the experiments, so you can
download reads and peaks to fully run the vignette. If you do so, you
should put the reads in a sub directory called reads and the peaks in
a sub directory called peaks. We intend to make all the vignette data
more easily obtainable; email the package authors if you are
So you'll have to download the actual data to run their example.
Your code also has a typo in the annotation parameter spelling: