Error: MK_dPCIIC - least-cost - trying to get slot "crs" from an object of a basic class ("character") with no slots

[SergioRoa1]

Hi!

I have been using the MK_dPCIIC function to estimate connectivity.

I am trying to use least cost distance but I keep getting the following error:

"Error in cost_distances(x = nodes, id = id, LCD = if (type == "least-cost") { :
trying to get slot "crs" from an object of a basic class ("character") with no slots"

Here is the code I am running:

relictos = shapefile("Relictos.shp")
relictos2 = as(relictos,"sf")
resistanceR = raster("quality_out_c_Daypus_2.tif")
plot(resistanceR)
PC <- MK_dPCIIC(nodes = relictos2,attribute = NULL,
distance = list(type = "least-cost", resistance = "resistanceR"),
metric = "PC", probability = 0.05,
distance_thresholds = 1000)

Do you know why it raises this error, and how I can fix it?

Thanks in advance!