Error(s) in re-building vignettes:
--- re-building ‘ExploreModelMap.Rnw’ using Sweave
Loading required package: randomForest
randomForest 4.6-14
Type rfNews() to see new features/changes/bug fixes.
Loading required package: raster
Loading required package: sp
Loading required package: rgdal
rgdal: version: 1.4-6, (SVN revision 841)
 Geospatial Data Abstraction Library extensions to R successfully loaded
 Loaded GDAL runtime: GDAL 2.3.2, released 2018/09/21
 Path to GDAL shared files: /usr/share/gdal
 GDAL binary built with GEOS: TRUE 
 Loaded PROJ.4 runtime: Rel. 5.2.0, September 15th, 2018, [PJ_VERSION: 520]
 Path to PROJ.4 shared files: (autodetected)
 Linking to sp version: 1.3-1 

Error: processing vignette 'ExploreModelMap.Rnw' failed with diagnostics:
 chunk 3 (label = ExSetup load package) 
Error : package or namespace load failed for ‘ModelMap’ in loadNamespace(i, c(lib.loc, .libPaths()), versionCheck = vI[[i]]):
 there is no package called ‘spam’

--- failed re-building ‘ExploreModelMap.Rnw’

--- re-building ‘VModelMap.Rnw’ using Sweave
Loading required package: randomForest
randomForest 4.6-14
Type rfNews() to see new features/changes/bug fixes.
Loading required package: raster
Loading required package: sp
Loading required package: rgdal
rgdal: version: 1.4-6, (SVN revision 841)
 Geospatial Data Abstraction Library extensions to R successfully loaded
 Loaded GDAL runtime: GDAL 2.3.2, released 2018/09/21
 Path to GDAL shared files: /usr/share/gdal
 GDAL binary built with GEOS: TRUE 
 Loaded PROJ.4 runtime: Rel. 5.2.0, September 15th, 2018, [PJ_VERSION: 520]
 Path to PROJ.4 shared files: (autodetected)
 Linking to sp version: 1.3-1 

Error: processing vignette 'VModelMap.Rnw' failed with diagnostics:
 chunk 3 (label = Ex1 load package) 
Error : package or namespace load failed for ‘ModelMap’ in loadNamespace(i, c(lib.loc, .libPaths()), versionCheck = vI[[i]]):
 there is no package called ‘spam’

--- failed re-building ‘VModelMap.Rnw’

--- re-building ‘Vquantile.Rnw’ using Sweave
Loading required package: randomForest
randomForest 4.6-14
Type rfNews() to see new features/changes/bug fixes.
Loading required package: raster
Loading required package: sp
Loading required package: rgdal
rgdal: version: 1.4-6, (SVN revision 841)
 Geospatial Data Abstraction Library extensions to R successfully loaded
 Loaded GDAL runtime: GDAL 2.3.2, released 2018/09/21
 Path to GDAL shared files: /usr/share/gdal
 GDAL binary built with GEOS: TRUE 
 Loaded PROJ.4 runtime: Rel. 5.2.0, September 15th, 2018, [PJ_VERSION: 520]
 Path to PROJ.4 shared files: (autodetected)
 Linking to sp version: 1.3-1 
Warning in FNcheck(OUTPUTfn = OUTPUTfn, folder = folder, ERROR.NAME = "OUTPUTfn") :
  OUTPUTfn VQuantile_QRF_Pinyon_map does not include an extension, using default extension of '.img'. New OUTPUTfn is VQuantile_QRF_Pinyon_map.img
Warning in FNcheck(OUTPUTfn = OUTPUTfn, folder = folder, ERROR.NAME = "OUTPUTfn") :
  OUTPUTfn VQuantile_QRF_Sage_map does not include an extension, using default extension of '.img'. New OUTPUTfn is VQuantile_QRF_Sage_map.img
Warning in FNcheck(OUTPUTfn = OUTPUTfn, folder = folder, ERROR.NAME = "OUTPUTfn") :
  OUTPUTfn VQuantile_CF_Pinyon_map does not include an extension, using default extension of '.img'. New OUTPUTfn is VQuantile_CF_Pinyon_map.img
Warning in FNcheck(OUTPUTfn = OUTPUTfn, folder = folder, ERROR.NAME = "OUTPUTfn") :
  OUTPUTfn VQuantile_CF_Sage_map does not include an extension, using default extension of '.img'. New OUTPUTfn is VQuantile_CF_Sage_map.img
--- finished re-building ‘Vquantile.Rnw’

SUMMARY: processing the following files failed:
  ‘ExploreModelMap.Rnw’ ‘VModelMap.Rnw’

Error: Vignette re-building failed.
Execution halted