Running examples in ‘amt-Ex.R’ failed
The error most likely occurred in:

> ### Name: coercion
> ### Title: Coerce a track to other formats.
> ### Aliases: coercion as_sp as_sp.steps_xy as_move as_move.track_xyt
> ###   as_ltraj as_ltraj.track_xy as_ltraj.track_xyt as_bcpa
> ###   as_bcpa.track_xyt as_telemetry as_telemetry.track_xyt as_moveHMM
> ###   as_moveHMM.track_xy
> 
> ### ** Examples
> 
> data(deer)
> as_move(deer)
class       : Move 
features    : 826 
extent      : 4309723, 4318383, 3442716, 3450713  (xmin, xmax, ymin, ymax)
crs         : +init=epsg:3035 +proj=laea +lat_0=52 +lon_0=10 +x_0=4321000 +y_0=3210000 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs 
variables   : 1
names       : burst_ 
min values  :      1 
max values  :     35 
timestamps  : 2008-03-30 00:01:47 ... 2009-04-28 00:00:21 Time difference of 394 days  (start ... end, duration) 
sensors     : unknown 
indiv. data :  
indiv. value:  
date created: 2020-08-04 07:26:00 
> as_move(deer, id = "foo")
class       : Move 
features    : 826 
extent      : 4309723, 4318383, 3442716, 3450713  (xmin, xmax, ymin, ymax)
crs         : +init=epsg:3035 +proj=laea +lat_0=52 +lon_0=10 +x_0=4321000 +y_0=3210000 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs 
variables   : 1
names       : burst_ 
min values  :      1 
max values  :     35 
timestamps  : 2008-03-30 00:01:47 ... 2009-04-28 00:00:21 Time difference of 394 days  (start ... end, duration) 
sensors     : unknown 
indiv. data :  
indiv. value:  
date created: 2020-08-04 07:26:00 
> data(deer)
> as_ltraj(deer)

*********** List of class ltraj ***********

Type of the traject: Type II (time recorded)
* Time zone: UTC *
Irregular traject. Variable time lag between two locs

Characteristics of the bursts:
        id    burst nb.reloc NAs          date.begin            date.end
1 animal_1 animal_1      826   0 2008-03-30 00:01:47 2009-04-28 00:00:21


 infolocs provided. The following variables are available:
[1] "pkey"
> as_ltraj(deer, id = "animal_3")

*********** List of class ltraj ***********

Type of the traject: Type II (time recorded)
* Time zone: UTC *
Irregular traject. Variable time lag between two locs

Characteristics of the bursts:
        id    burst nb.reloc NAs          date.begin            date.end
1 animal_3 animal_3      826   0 2008-03-30 00:01:47 2009-04-28 00:00:21


 infolocs provided. The following variables are available:
[1] "pkey"
> data(deer)
> d <- as_bcpa(deer)
> data(deer)
> as_telemetry(deer)
Warning in wkt(obj) : CRS object has no comment
Warning in wkt(CRS(tg)) : CRS object has no comment
Error in (function (cond)  : 
  error in evaluating the argument 'obj' in selecting a method for function 'coordinates': is.character(proj) is not TRUE
Calls: as_telemetry ... <Anonymous> -> <Anonymous> -> get_aoi -> project -> stopifnot
Execution halted