Error(s) in re-building vignettes:
  ...
--- re-building ‘introduction_to_dnapath.Rmd’ using rmarkdown
Quitting from lines 214-217 (introduction_to_dnapath.Rmd) 
Error: processing vignette 'introduction_to_dnapath.Rmd' failed with diagnostics:
You must provide a valid Mart object. To create a Mart object use the function: useMart.  Check ?useMart for more information.
--- failed re-building ‘introduction_to_dnapath.Rmd’

--- re-building ‘package_data.Rmd’ using rmarkdown
Rows: 14 Columns: 88
── Column specification ────────────────────────────────────────────────────────
Delimiter: "\t"
chr (88): attrib_name, TCGA.3H.AB3O, TCGA.3H.AB3S, TCGA.3U.A98E, TCGA.3U.A98...

ℹ Use `spec()` to retrieve the full column specification for this data.
ℹ Specify the column types or set `show_col_types = FALSE` to quiet this message.
Rows: 19581 Columns: 88
── Column specification ────────────────────────────────────────────────────────
Delimiter: "\t"
chr  (1): attrib_name
dbl (87): TCGA.3H.AB3K, TCGA.3H.AB3L, TCGA.3H.AB3M, TCGA.3H.AB3O, TCGA.3H.AB...

ℹ Use `spec()` to retrieve the full column specification for this data.
ℹ Specify the column types or set `show_col_types = FALSE` to quiet this message.
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--- finished re-building ‘package_data.Rmd’

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

Error: Vignette re-building failed.
Execution halted