Error(s) in re-building vignettes:
  ...
--- re-building ‘Using_predictInterval.Rmd’ using rmarkdown
Loading required package: arm
Loading required package: MASS
Loading required package: Matrix
Loading required package: lme4

arm (Version 1.10-1, built: 2018-4-12)

Working directory is /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/merTools.Rcheck/vign_test/merTools/vignettes

Loading required package: dplyr

Attaching package: 'dplyr'

The following object is masked from 'package:MASS':

    select

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

Quitting from lines 161-166 (Using_predictInterval.Rmd) 
Error: processing vignette 'Using_predictInterval.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘Using_predictInterval.Rmd’

--- re-building ‘imputation.Rmd’ using rmarkdown
Loading required package: arm
Loading required package: MASS
Loading required package: Matrix
Loading required package: lme4

arm (Version 1.10-1, built: 2018-4-12)

Working directory is /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/merTools.Rcheck/vign_test/merTools/vignettes

Loading required package: dplyr

Attaching package: 'dplyr'

The following object is masked from 'package:MASS':

    select

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

Loading required package: Rcpp
## 
## Amelia II: Multiple Imputation
## (Version 1.7.5, built: 2018-05-07)
## Copyright (C) 2005-2019 James Honaker, Gary King and Matthew Blackwell
## Refer to http://gking.harvard.edu/amelia/ for more information
## 
--- finished re-building ‘imputation.Rmd’

--- re-building ‘merToolsIntro.Rmd’ using rmarkdown
Loading required package: arm
Loading required package: MASS
Loading required package: Matrix
Loading required package: lme4

arm (Version 1.10-1, built: 2018-4-12)

Working directory is /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/merTools.Rcheck/vign_test/merTools/vignettes

Loading required package: dplyr

Attaching package: 'dplyr'

The following object is masked from 'package:MASS':

    select

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

Quitting from lines 88-97 (merToolsIntro.Rmd) 
Error: processing vignette 'merToolsIntro.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘merToolsIntro.Rmd’

SUMMARY: processing the following files failed:
  ‘Using_predictInterval.Rmd’ ‘merToolsIntro.Rmd’

Error: Vignette re-building failed.
Execution halted