rWind: Error in if (is.numeric(v) && any(v < 0)) { : missing value where TRUE/FALSE needed

Hi,
I'm trying to work with rWind but when try to create a shortestpath (From
point a to B with gdistance package) I have this error:

Error in if (is.numeric(v) && any(v < 0)) { :
  missing value where TRUE/FALSE needed

so this is the code:

library(rWind)
library(raster)
library(gdistance)

w<-wind.dl(2020, 2, 12, 0,-17,28,45,50) #download all Mediterranea area

wind<-wind2raster(w) # create two raster about speed and direction wind

Conductance<-flow.dispersion(wind)

AtoBo<- shortestPath(Conductance,spagna,libano,output="SpatialLines")
#create shortestpath (spagna and libano are two SpatialPointsDataFrame)

where I wrong?

Thanks in advance
E