issue with met_type="hrrr" and direction="backward"

[dmmmercer]

I am trying to use splitr with the "hrrr" met_type (files already downloaded) and the "backward" direction.
This short test code works if I run with "hrrr" but with forward direction, instead. Or, it works if I use a different met_type and backward direction.
But with 'hrrr' and 'backward' I get this error: Error in seq.int(0, to0 - from, by) : wrong sign in 'by' argument

I am new to splitr but would like to use it to run a series of backward trajectories with hrrr.
Any help would be welcome!

#Run HYSPLIT with hrrr downloaded met files
trajectory <-
hysplit_trajectory(
traj_name = "July152015traj",
lat = 42.3316,
lon = -122.8806,
#height = 100,
#model_height = 10000,
duration = 4,
run_period = c("2015-07-15"),
daily_hours = c(12, 18),
direction = "backward",
met_type = "hrrr",
met_dir = ("D:/SplitRwd/met"),
exec_dir = ("D:/SplitRwd/output3"),
extended_met = FALSE)

[XiaoyuChen97]

I just find there might be some small issues inside function get_met_hrrr, it can be solved by revising this part code manually.