Package check result: ERROR

Check: examples, Result: ERROR
  Running examples in ‘FORTLS-Ex.R’ failed
  The error most likely occurred in:
  
  > base::assign(".ptime", proc.time(), pos = "CheckExEnv")
  > ### Name: tree.detection.several.plots
  > ### Title: Tree-Level Variables Estimation for Several Plots
  > ### Aliases: tree.detection.several.plots
  > 
  > ### ** Examples
  > 
  > 
  > ## No test: 
  > 
  > # Establishment of working directories (optional)
  > # By default here we propose the current working directory of the R process
  > 
  > dir.data <- tempdir()
  > dir.result <- tempdir()
  > 
  > # Loading example data (LAZ files) to dir.data
  > 
  > download.file(
  + "www.dropbox.com/scl/fi/hzzrt0a39crdy6uvcj9el/PinusSylve1.laz?rlkey=svpwvorkm8889fgbnj14ns1f2&dl=1",
  +               destfile = file.path(dir.data, "PinusSylvestris1.laz"),
  +               mode = "wb")
  trying URL 'www.dropbox.com/scl/fi/hzzrt0a39crdy6uvcj9el/PinusSylve1.laz?rlkey=svpwvorkm8889fgbnj14ns1f2&dl=1'
  Content type 'application/binary' length 23093707 bytes (22.0 MB)
  ==================================================
  downloaded 22.0 MB
  
  > 
  > download.file(
  + "www.dropbox.com/scl/fi/zeszze31jh5m1g4o3ns1o/PinusSylve2.laz?rlkey=wx72bi6ggdc7wedwgzupekp9k&dl=1",
  +               destfile = file.path(dir.data, "PinusSylvestris2.laz"),
  +               mode = "wb")
  trying URL 'www.dropbox.com/scl/fi/zeszze31jh5m1g4o3ns1o/PinusSylve2.laz?rlkey=wx72bi6ggdc7wedwgzupekp9k&dl=1'
  Content type 'application/binary' length 19650235 bytes (18.7 MB)
  ==================================================
  downloaded 18.7 MB
  
  > 
  > 
  > # Tree detection (TLS single-scan aproach)
  > 
  > id <- c("PinusSylvestris1", "PinusSylvestris2")
  > 
  > center.coord <- data.frame(id = id,
  +                            x = rep(0, length(id)),
  +                            y = rep(0, length(id)))
  > 
  > tree.tls <- tree.detection.several.plots(las.list =
  +                                          c("PinusSylvestris1.laz",
  +                                            "PinusSylvestris2.laz"),
  + 
  +                                          id.list = id,
  + 
  +                                          center.coord = center.coord,
  + 
  +                                          tls.resolution = list(point.dist = 7.67, tls.dist = 10),
  + 
  +                                          max.dist = 5,
  + 
  +                                          threads = 2,
  + 
  +                                          plot = TRUE)
  Computing plot: PinusSylvestris1
  Normalizing
  Error: File does not exist.
  Execution halted

Check: for non-standard things in the check directory, Result: NOTE
  Found the following files/directories:
    ‘PiceaAbies.laz’ ‘PiceaAbies.txt’ ‘PinusRadiata.laz’
    ‘PinusRadiata.txt’ ‘RB.G.angle.count.html’ ‘RB.G.fixed.area.html’
    ‘RB.G.k.tree.html’ ‘RB.N.angle.count.html’ ‘RB.N.fixed.area.html’
    ‘RB.N.k.tree.html’ ‘RB.V.angle.count.html’ ‘RB.angle.count.csv’
    ‘RB.d.angle.count.html’ ‘RB.d.fixed.area.html’ ‘RB.d.k.tree.html’
    ‘RB.fixed.area.csv’ ‘RB.h.angle.count.html’ ‘RB.h.fixed.area.html’
    ‘RB.h.k.tree.html’ ‘RB.k.tree.csv’ ‘stem.curve.csv’ ‘tree.tls.csv’