Error(s) in re-building vignettes:
  ...
--- re-building ‘III_individual_phenometrics.Rmd’ using knitr
--- finished re-building ‘III_individual_phenometrics.Rmd’

--- re-building ‘II_status_intensity.Rmd’ using knitr
--- finished re-building ‘II_status_intensity.Rmd’

--- re-building ‘IV_site_phenometrics.Rmd’ using knitr
--- finished re-building ‘IV_site_phenometrics.Rmd’

--- re-building ‘I_introduction.Rmd’ using knitr
--- finished re-building ‘I_introduction.Rmd’

--- re-building ‘VIII_data_cleaning.Rmd’ using knitr
--- finished re-building ‘VIII_data_cleaning.Rmd’

--- re-building ‘VII_combine_raster_point.Rmd’ using knitr
--- finished re-building ‘VII_combine_raster_point.Rmd’

--- re-building ‘VI_geospatial.Rmd’ using knitr
trying URL 'https://geoserver.usanpn.org/geoserver/wcs?service=WCS&version=2.0.1&request=GetCoverage&format=geotiff&coverageId=gdd:agdd_50f&SUBSET=time("2019-06-25T00:00:00.000Z")'
downloaded 18.0 MB

** Processing: figure/unnamed-chunk-9-1.png
504x504 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 70012 bytes
Input file size = 70186 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 54487
  zc = 9  zm = 8  zs = 1  f = 0
  zc = 1  zm = 8  zs = 2  f = 0
  zc = 9  zm = 8  zs = 3  f = 0
  zc = 9  zm = 8  zs = 0  f = 5
  zc = 9  zm = 8  zs = 1  f = 5
  zc = 1  zm = 8  zs = 2  f = 5
  zc = 9  zm = 8  zs = 3  f = 5
                               
Selecting parameters:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 54487

Output IDAT size = 54487 bytes (15525 bytes decrease)
Output file size = 54565 bytes (15621 bytes = 22.26% decrease)

trying URL 'https://geoserver.usanpn.org/geoserver/wcs?service=WCS&version=2.0.1&request=GetCoverage&format=geotiff&coverageId=si-x:average_bloom_best&SUBSET=time("1905-01-01T00:00:00.000Z")'

Quitting from lines 168-173 [unnamed-chunk-12] (VI_geospatial.Rmd)
Error: processing vignette 'VI_geospatial.Rmd' failed with diagnostics:
no applicable method for `@` applied to an object of class "NULL"
--- failed re-building ‘VI_geospatial.Rmd’

--- re-building ‘V_magnitude_phenometrics.Rmd’ using knitr
--- finished re-building ‘V_magnitude_phenometrics.Rmd’

SUMMARY: processing the following file failed:
  ‘VI_geospatial.Rmd’

Error: Vignette re-building failed.
Execution halted