Error(s) in re-building vignettes:
  ...
--- re-building 'TSTr.Rmd' using rmarkdown
Quitting from lines 167-170 (TSTr.Rmd) 
Error: processing vignette 'TSTr.Rmd' failed with diagnostics:
'length = 742' in coercion to 'logical(1)'
--- failed re-building 'TSTr.Rmd'

SUMMARY: processing the following file failed:
  'TSTr.Rmd'

Error: Vignette re-building failed.
Execution halted
Found the following files/directories:
  'XMIwords.txt'
Found the following files/directories:
  ‘XMIwords.txt’
Error(s) in re-building vignettes:
--- re-building ‘TSTr.Rmd’ using rmarkdown
Quitting from lines 167-170 (TSTr.Rmd) 
Error: processing vignette 'TSTr.Rmd' failed with diagnostics:
'length = 241' in coercion to 'logical(1)'
--- failed re-building ‘TSTr.Rmd’

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

Error: Vignette re-building failed.
Execution halted
Found the following files/directories:
  ‘XMIwords.txt’
Error(s) in re-building vignettes:
--- re-building ‘TSTr.Rmd’ using rmarkdown
Quitting from lines 167-170 (TSTr.Rmd) 
Error: processing vignette 'TSTr.Rmd' failed with diagnostics:
'length = 1141' in coercion to 'logical(1)'
--- failed re-building ‘TSTr.Rmd’

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

Error: Vignette re-building failed.
Execution halted
Found the following files/directories:
  ‘XMIwords.txt’
Found the following files/directories:
  ‘XMIwords.txt’
Found the following files/directories:
  ‘XMIwords.txt’

Imports includes 29 non-default packages.
Importing from so many packages makes the package vulnerable to any of
them becoming unavailable.  Move as many as possible to Suggests and
use conditionally.
Namespaces in Imports field not imported from:
  ‘foreign’ ‘grid’ ‘intergraph’ ‘lordif’ ‘survey’
  All declared Imports should be used.
Namespaces in Imports field not imported from:
  ‘foreign’ ‘grid’ ‘intergraph’ ‘lordif’ ‘survey’
  All declared Imports should be used.
Namespaces in Imports field not imported from:
  ‘foreign’ ‘grid’ ‘intergraph’ ‘lordif’ ‘survey’
  All declared Imports should be used.
Namespaces in Imports field not imported from:
  ‘foreign’ ‘grid’ ‘intergraph’ ‘lordif’ ‘survey’
  All declared Imports should be used.
Namespaces in Imports field not imported from:
  ‘foreign’ ‘grid’ ‘intergraph’ ‘lordif’ ‘survey’
  All declared Imports should be used.
Namespaces in Imports field not imported from:
  ‘foreign’ ‘grid’ ‘intergraph’ ‘lordif’ ‘survey’
  All declared Imports should be used.