Error in re-building vignettes:
  ...
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: 1.3-3, (SVN revision 759)
 Geospatial Data Abstraction Library extensions to R successfully loaded
 Loaded GDAL runtime: GDAL 2.2.4, released 2018/03/19
 Path to GDAL shared files: /usr/local/share/gdal
 GDAL binary built with GEOS: TRUE 
 Loaded PROJ.4 runtime: Rel. 5.0.1, April 1st, 2018, [PJ_VERSION: 501]
 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 VModelMapEx1a_map does not include an extension, using default extension of '.img'. New OUTPUTfn is VModelMapEx1a_map.img
Warning in FNcheck(OUTPUTfn = OUTPUTfn, folder = folder, ERROR.NAME = "OUTPUTfn") :
  OUTPUTfn VModelMapEx1b_map does not include an extension, using default extension of '.img'. New OUTPUTfn is VModelMapEx1b_map.img
Warning in FNcheck(OUTPUTfn = OUTPUTfn, folder = folder, ERROR.NAME = "OUTPUTfn") :
  OUTPUTfn VModelMapEx2a_map does not include an extension, using default extension of '.img'. New OUTPUTfn is VModelMapEx2a_map.img
Warning in FNcheck(OUTPUTfn = OUTPUTfn, folder = folder, ERROR.NAME = "OUTPUTfn") :
  OUTPUTfn VModelMapEx2b_map does not include an extension, using default extension of '.img'. New OUTPUTfn is VModelMapEx2b_map.img
Warning in FNcheck(OUTPUTfn = OUTPUTfn, folder = folder, ERROR.NAME = "OUTPUTfn") :
  OUTPUTfn VModelMapEx3_map does not include an extension, using default extension of '.img'. New OUTPUTfn is VModelMapEx3_map.img
Warning in model.SGB(qdata = qdata, predList = predList, response.name = response.name,  :
  ModelMap currently uses OOB estimation to determine optimal number of trees in SGB model when calling 'gbm.perf' in the gbm package however OOB generally underestimates the optimal number of iterations although predictive performance is reasonably competitive however using cv.folds>0 when calling gbm usually results in improved predictive performance but is not yet supported in ModelMap
Warning in model.SGB(qdata = qdata, predList = predList, response.name = response.name,  :
  ModelMap currently uses OOB estimation to determine optimal number of trees in SGB model when calling 'gbm.perf' in the gbm package however OOB generally underestimates the optimal number of iterations although predictive performance is reasonably competitive however using cv.folds>0 when calling gbm usually results in improved predictive performance but is not yet supported in ModelMap
Warning in FNcheck(OUTPUTfn = OUTPUTfn, folder = folder, ERROR.NAME = "OUTPUTfn") :
  OUTPUTfn VModelMapEx4a_map does not include an extension, using default extension of '.img'. New OUTPUTfn is VModelMapEx4a_map.img
Warning in FNcheck(OUTPUTfn = OUTPUTfn, folder = folder, ERROR.NAME = "OUTPUTfn") :
  OUTPUTfn VModelMapEx4b_map does not include an extension, using default extension of '.img'. New OUTPUTfn is VModelMapEx4b_map.img
Warning in file.remove("Rplots.pdf") :
  cannot remove file 'Rplots.pdf', reason 'No such file or directory'
Error in texi2dvi(file = file, pdf = TRUE, clean = clean, quiet = quiet,  : 
  Running 'texi2dvi' on 'VModelMap.tex' failed.
LaTeX errors:
! Undefined control sequence.
\UseRawInputEncoding ...tencodingname \@undefined 
                                                  \let \DeclareFontEncoding@...
l.1227 ...itet{vaughan05}, and \citet{reineking06}
                                                  . In a Calibration plot th...
! Missing \endcsname inserted.
<to be read again> 
                   \let 
l.1227 ...itet{vaughan05}, and \citet{reineking06}
                                                  . In a Calibration plot th...
! Missing \endcsname inserted.
<to be read again> 
                   \let 
l.1227 ...itet{vaughan05}, and \citet{reineking06}
                                                  . In a Calibration plot th...
! Missing \endcsname inserted.
<to be read again> 
                   \let 
l.1227 ...itet{vaughan05}, and \citet{reineking06}
                                                  . In a Calibration plot th...
! Undefined contr
Calls: buildVignettes -> texi2pdf -> texi2dvi
Execution halted