Error(s) in re-building vignettes:
  ...
--- re-building ‘Exposure_Response_Example.Rmd’ using rmarkdown
Building exprespmodel ... done.
Picking joint bandwidth of 0.015
Picking joint bandwidth of 0.015
Picking joint bandwidth of 0.0647
Picking joint bandwidth of 0.049
Picking joint bandwidth of 0.0482
Picking joint bandwidth of 0.065
`summarise()` has grouped output by 'paramname', 'ID', 'WT', 'DOSE', 'SEV', 'covname'. You can override using the `.groups` argument.
Scale for 'x' is already present. Adding another scale for 'x', which will
replace the existing scale.
--- finished re-building ‘Exposure_Response_Example.Rmd’

--- re-building ‘Introduction_to_coveffectsplot.Rmd’ using rmarkdown
Picking joint bandwidth of 0.0273
Picking joint bandwidth of 0.0326
Warning: Removed 57 rows containing non-finite values (stat_density).
--- finished re-building ‘Introduction_to_coveffectsplot.Rmd’

--- re-building ‘PKPD_Example.Rmd’ using rmarkdown
Building codepkpdmodelcov ... done.
Scale for 'x' is already present. Adding another scale for 'x', which will
replace the existing scale.
Picking joint bandwidth of 0.0284
Picking joint bandwidth of 0.0401
Picking joint bandwidth of 0.0322
Picking joint bandwidth of 0.0274
Picking joint bandwidth of 0.0406
Picking joint bandwidth of 0.0292
Picking joint bandwidth of 0.0274
Picking joint bandwidth of 0.0401
Picking joint bandwidth of 0.0303
Picking joint bandwidth of 0.0282
Picking joint bandwidth of 0.0397
Picking joint bandwidth of 0.0311
Picking joint bandwidth of 0.0374
Picking joint bandwidth of 0.0467
Picking joint bandwidth of 0.0414
Picking joint bandwidth of 0.0274
Picking joint bandwidth of 0.0401
Picking joint bandwidth of 0.0305
`summarise()` has grouped output by 'paramname', 'covname'. You can override using the `.groups` argument.
Scale for 'x' is already present. Adding another scale for 'x', which will
replace the existing scale.
--- finished re-building ‘PKPD_Example.Rmd’

--- re-building ‘PK_Example.Rmd’ using rmarkdown
Building codepkmodelcov ... done.
Warning: Transformation introduced infinite values in continuous y-axis
Picking joint bandwidth of 0.0169
Picking joint bandwidth of 0.0357
Picking joint bandwidth of 0.0117
Picking joint bandwidth of 0.0169
Picking joint bandwidth of 0.0357
Picking joint bandwidth of 0.0117
Quitting from lines 406-466 (PK_Example.Rmd) 
Error: processing vignette 'PK_Example.Rmd' failed with diagnostics:
A non-empty vector of column names for `by` is required.
--- failed re-building ‘PK_Example.Rmd’

--- re-building ‘Pediatric_Cov_Sim.Rmd’ using rmarkdown
Building pedpkmodelcov ... done.
Warning: Transformation introduced infinite values in continuous y-axis
Picking joint bandwidth of 0.0339
Picking joint bandwidth of 0.0167
Warning in table1::eqcut(AGE, 2, f) :
  Because of duplicate values, it's not possible to form 2 equal-sized groups. Largest group size: 65000; smallest group size: 62400
Warning in table1::eqcut(AGE, 2, f) :
  Because of duplicate values, it's not possible to form 2 equal-sized groups. Largest group size: 65000; smallest group size: 62400
Warning in table1::eqcut(AGE, 2, f) :
  Because of duplicate values, it's not possible to form 2 equal-sized groups. Largest group size: 65000; smallest group size: 62400
`summarise()` has grouped output by 'ID', 'SEX', 'AGE'. You can override using the `.groups` argument.
Warning in table1::eqcut(nca.summaries$WT, 3, varlabel = "Weight") :
  Because of duplicate values, it's not possible to form 3 equal-sized groups. Largest group size: 3268; smallest group size: 3266
Warning in table1::eqcut(nca.summaries$AGE, 4, varlabel = "Age") :
  Because of duplicate values, it's not possible to form 4 equal-sized groups. Largest group size: 2600; smallest group size: 2400
Warning: attributes are not identical across measure variables;
they will be dropped
Picking joint bandwidth of 0.0241
Picking joint bandwidth of 0.0289
Picking joint bandwidth of 0.013
Picking joint bandwidth of 0.0155
Picking joint bandwidth of 0.0108
Picking joint bandwidth of 0.0129
Picking joint bandwidth of 0.0207
Picking joint bandwidth of 0.0249
Picking joint bandwidth of 0.0276
Picking joint bandwidth of 0.0332
`summarise()` has grouped output by 'paramname', 'covname'. You can override using the `.groups` argument.
Scale for 'x' is already present. Adding another scale for 'x', which will
replace the existing scale.
--- finished re-building ‘Pediatric_Cov_Sim.Rmd’

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

Error: Vignette re-building failed.
Execution halted