Package check result: ERROR

Check: examples, Result: ERROR
  Running examples in ‘bioRad-Ex.R’ failed
  The error most likely occurred in:
  
  > base::assign(".ptime", proc.time(), pos = "CheckExEnv")
  > ### Name: apply_mistnet
  > ### Title: Apply MistNet segmentation to a polar volume
  > ### Aliases: apply_mistnet
  > 
  > ### ** Examples
  > 
  > ## No test: 
  > # make sure you have installed the MistNet libraries and install if necessary:
  > if (requireNamespace("vol2birdR", quietly = TRUE) && vol2birdR::mistnet_exists()){
  + if(!vol2birdR::mistnet_exists()){
  +    vol2birdR::install_mistnet()
  +    vol2birdR::install_mistnet_model()
  + }
  + # start a temporary file to store polar volume
  + tempfile=tempfile("KBGM_example")
  + # Download a NEXRAD file and save as KBGM_example
  + download.file(
  +   "https://noaa-nexrad-level2.s3.amazonaws.com/2019/10/01/KBGM/KBGM20191001_000542_V06",
  +   method="libcurl", mode="wb", tempfile
  + )
  + 
  + # Calculate MistNet segmentation
  + mistnet_pvol <- apply_mistnet(tempfile)
  + 
  + # Print summary info for the segmented elevation scan at the 0.5 degree,
  + # verify new parameters BIOLOGY, WEATHER, BACKGROUND and CELL have been added
  + scan <- get_scan(mistnet_pvol, 0.5)
  + scan
  + 
  + # Project the scan as a ppi
  + ppi <- project_as_ppi(scan, range_max = 100000)
  + 
  + # Plot the reflectivity parameter
  + plot(ppi, param = "DBZH")
  + 
  + # Plot the MistNet class probability [0-1] for weather
  + plot(ppi, param = "WEATHER")
  + 
  + # Plot the MistNet class probability [0-1] for biology
  + plot(ppi, param = "BIOLOGY")
  + 
  + # Plot the final segmentation result, with values >1 indicating
  + # areas classified as weather, and value 1 pixels that fall within an
  + # additional 5 km fringe around weather areas
  + plot(ppi, param = "CELL")
  + 
  + # Remove file
  + file.remove(tempfile)
  + }
  trying URL 'https://noaa-nexrad-level2.s3.amazonaws.com/2019/10/01/KBGM/KBGM20191001_000542_V06'
  Content type 'binary/octet-stream' length 3950079 bytes (3.8 MB)
  ==================================================
  downloaded 3.8 MB
  
  Error: mistnet model file not found, point `mistNetPath` option to valid mistnet file or download the model with `install_mistnet_model()`
  Execution halted