make.calibration throws overlap error.

[LukeNash28]

I'm surely missing something stupid, but I can't find a single answer to this on any of the manuals or the forums.

Every time I'm calling make.calibration, the following error throws:

Error in make.calibration: Calibration periods overlap

• The data I'm using is the twilight and raw data from the Red-necked Stint tracking study from Southern Chukotka, available on Movebank (https://www.doi.org/10.5441/001/1.fd53sn40). It has been processed into a TAGS object using twGeos2TAGS.
• I've tried various permutations of the following data frame:

calibration_periods <- data.frame(calibration.start = as.POSIXct(c(NA, "2016-07-02")), calibration.stop = as.POSIXct("2016-07-05", NA), lon = 176.844, lat = 62.621)

This includes removing the NA from the calibration.stop column, as was suggested on another thread.

Does anyone know what's going wrong? Hopefully the error is reproducible.