Error(s) in re-building vignettes:
  ...
--- re-building 'ACSN-vignette.Rmd' using rmarkdown
Quitting from lines 70-72 (ACSN-vignette.Rmd) 
Error: processing vignette 'ACSN-vignette.Rmd' failed with diagnostics:
attempt to use zero-length variable name
--- failed re-building 'ACSN-vignette.Rmd'

--- re-building 'ACSN_map_updating.Rmd' using rmarkdown
--- finished re-building 'ACSN_map_updating.Rmd'

SUMMARY: processing the following file failed:
  'ACSN-vignette.Rmd'

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
  ...
--- re-building ‘ACSN-vignette.Rmd’ using rmarkdown
Quitting from lines 70-72 (ACSN-vignette.Rmd) 
Error: processing vignette ‘ACSN-vignette.Rmd’ failed with diagnostics:
attempt to use zero-length variable name
--- failed re-building ‘ACSN-vignette.Rmd’

--- re-building ‘ACSN_map_updating.Rmd’ using rmarkdown
--- finished re-building ‘ACSN_map_updating.Rmd’

SUMMARY: processing the following file failed:
  ‘ACSN-vignette.Rmd’

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
--- re-building ‘ACSN-vignette.Rmd’ using rmarkdown
Quitting from lines 70-72 (ACSN-vignette.Rmd) 
Error: processing vignette 'ACSN-vignette.Rmd' failed with diagnostics:
attempt to use zero-length variable name
--- failed re-building ‘ACSN-vignette.Rmd’

--- re-building ‘ACSN_map_updating.Rmd’ using rmarkdown
--- finished re-building ‘ACSN_map_updating.Rmd’

SUMMARY: processing the following file failed:
  ‘ACSN-vignette.Rmd’

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
--- re-building ‘ACSN-vignette.Rmd’ using rmarkdown
Quitting from lines 70-72 (ACSN-vignette.Rmd) 
Error: processing vignette 'ACSN-vignette.Rmd' failed with diagnostics:
attempt to use zero-length variable name
--- failed re-building ‘ACSN-vignette.Rmd’

--- re-building ‘ACSN_map_updating.Rmd’ using rmarkdown
--- finished re-building ‘ACSN_map_updating.Rmd’

SUMMARY: processing the following file failed:
  ‘ACSN-vignette.Rmd’

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
--- re-building 'ACSN-vignette.Rmd' using rmarkdown
Quitting from lines 70-72 (ACSN-vignette.Rmd) 
Error: processing vignette 'ACSN-vignette.Rmd' failed with diagnostics:
attempt to use zero-length variable name
--- failed re-building 'ACSN-vignette.Rmd'

--- re-building 'ACSN_map_updating.Rmd' using rmarkdown
--- finished re-building 'ACSN_map_updating.Rmd'

SUMMARY: processing the following file failed:
  'ACSN-vignette.Rmd'

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
--- re-building 'ACSN-vignette.Rmd' using rmarkdown
Quitting from lines 70-72 (ACSN-vignette.Rmd) 
Error: processing vignette 'ACSN-vignette.Rmd' failed with diagnostics:
attempt to use zero-length variable name
--- failed re-building 'ACSN-vignette.Rmd'

--- re-building 'ACSN_map_updating.Rmd' using rmarkdown
--- finished re-building 'ACSN_map_updating.Rmd'

SUMMARY: processing the following file failed:
  'ACSN-vignette.Rmd'

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
  ...
--- re-building ‘ACSN-vignette.Rmd’ using rmarkdown
Quitting from lines 70-72 (ACSN-vignette.Rmd) 
Error: processing vignette 'ACSN-vignette.Rmd' failed with diagnostics:
attempt to use zero-length variable name
--- failed re-building ‘ACSN-vignette.Rmd’

--- re-building ‘ACSN_map_updating.Rmd’ using rmarkdown
--- finished re-building ‘ACSN_map_updating.Rmd’

SUMMARY: processing the following file failed:
  ‘ACSN-vignette.Rmd’

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
  ...
--- re-building ‘ACSN-vignette.Rmd’ using rmarkdown
Quitting from lines 70-72 (ACSN-vignette.Rmd) 
Error: processing vignette 'ACSN-vignette.Rmd' failed with diagnostics:
attempt to use zero-length variable name
--- failed re-building ‘ACSN-vignette.Rmd’

--- re-building ‘ACSN_map_updating.Rmd’ using rmarkdown
--- finished re-building ‘ACSN_map_updating.Rmd’

SUMMARY: processing the following file failed:
  ‘ACSN-vignette.Rmd’

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
--- re-building 'ACSN-vignette.Rmd' using rmarkdown
Quitting from lines 70-72 (ACSN-vignette.Rmd) 
Error: processing vignette 'ACSN-vignette.Rmd' failed with diagnostics:
attempt to use zero-length variable name
--- failed re-building 'ACSN-vignette.Rmd'

--- re-building 'ACSN_map_updating.Rmd' using rmarkdown
--- finished re-building 'ACSN_map_updating.Rmd'

SUMMARY: processing the following file failed:
  'ACSN-vignette.Rmd'

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
--- re-building 'ACSN-vignette.Rmd' using rmarkdown
Quitting from lines 70-72 (ACSN-vignette.Rmd) 
Error: processing vignette 'ACSN-vignette.Rmd' failed with diagnostics:
attempt to use zero-length variable name
--- failed re-building 'ACSN-vignette.Rmd'

--- re-building 'ACSN_map_updating.Rmd' using rmarkdown
--- finished re-building 'ACSN_map_updating.Rmd'

SUMMARY: processing the following file failed:
  'ACSN-vignette.Rmd'

Error: Vignette re-building failed.
Execution halted