Error with sound_pressure_level() function

[OCMetcalf]

Hi,

I'm trying to measure the relative SPL of some sounds in wav files with an 8kHz sampling rate, running on Windows. I am reading in a csv that's been exported from Raven with start and end times in seconds, and high and low frequencies in khZ, adjusting the column headings to match those required by warbleR, then running the function with arguments to both apply a frequency filter and remove background noise:

spl<-sound_pressure_level(dat, path = path, pb = TRUE,
type = "mean", wl = 512, bp = "freq.range", remove.bgn = TRUE, mar = 1, envelope = "abs")

I get the following error, which i'm struggling to understand:
| 0 % ~calculating Error in seq.default(0.01, signal.noise, by = 0.01) :
wrong sign in 'by' argument

Thanks,
Ollie