Error(s) in re-building vignettes:
  ...
--- re-building ‘expp.Rmd’ using rmarkdown
Loading required package: expp
This is expp 1.2.5 For a tutorial type vignette("expp")

Attaching package: 'expp'

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

    as.data.frame

Quitting from lines 103-105 (expp.Rmd) 
Error: processing vignette ‘expp.Rmd’ failed with diagnostics:
unable to find an inherited method for function 'as.data.frame' for signature '"list"'
--- failed re-building ‘expp.Rmd’

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

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
  ...
--- re-building ‘expp.Rmd’ using rmarkdown
Loading required package: expp
This is expp 1.2.5 For a tutorial type vignette("expp")

Attaching package: 'expp'

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

    as.data.frame

Quitting from lines 103-105 (expp.Rmd) 
Error: processing vignette ‘expp.Rmd’ failed with diagnostics:
unable to find an inherited method for function 'as.data.frame' for signature '"list"'
--- failed re-building ‘expp.Rmd’

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

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
--- re-building ‘expp.Rmd’ using rmarkdown
Loading required package: expp
This is expp 1.2.5 For a tutorial type vignette("expp")

Attaching package: 'expp'

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

    as.data.frame

Quitting from lines 103-105 (expp.Rmd) 
Error: processing vignette 'expp.Rmd' failed with diagnostics:
unable to find an inherited method for function 'as.data.frame' for signature '"list"'
--- failed re-building ‘expp.Rmd’

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

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
--- re-building 'expp.Rmd' using rmarkdown
Loading required package: expp
This is expp 1.2.5 For a tutorial type vignette("expp")

Attaching package: 'expp'

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

    as.data.frame

Quitting from lines 103-105 (expp.Rmd) 
Error: processing vignette 'expp.Rmd' failed with diagnostics:
unable to find an inherited method for function 'as.data.frame' for signature '"list"'
--- failed re-building 'expp.Rmd'

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

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
  ...
--- re-building ‘expp.Rmd’ using rmarkdown
Loading required package: expp
This is expp 1.2.5 For a tutorial type vignette("expp")

Attaching package: 'expp'

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

    as.data.frame

Quitting from lines 103-105 (expp.Rmd) 
Error: processing vignette ‘expp.Rmd’ failed with diagnostics:
unable to find an inherited method for function 'as.data.frame' for signature '"list"'
--- failed re-building ‘expp.Rmd’

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

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
  ...
--- re-building ‘expp.Rmd’ using rmarkdown
Loading required package: expp
This is expp 1.2.5 For a tutorial type vignette("expp")

Attaching package: 'expp'

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

    as.data.frame

Quitting from lines 103-105 (expp.Rmd) 
Error: processing vignette ‘expp.Rmd’ failed with diagnostics:
unable to find an inherited method for function 'as.data.frame' for signature '"list"'
--- failed re-building ‘expp.Rmd’

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

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
--- re-building 'expp.Rmd' using rmarkdown
Loading required package: expp
This is expp 1.2.5 For a tutorial type vignette("expp")

Attaching package: 'expp'

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

    as.data.frame

Quitting from lines 103-105 (expp.Rmd) 
Error: processing vignette 'expp.Rmd' failed with diagnostics:
unable to find an inherited method for function 'as.data.frame' for signature '"list"'
--- failed re-building 'expp.Rmd'

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

Error: Vignette re-building failed.
Execution halted
Error(s) in re-building vignettes:
--- re-building 'expp.Rmd' using rmarkdown
Loading required package: expp
This is expp 1.2.5 For a tutorial type vignette("expp")

Attaching package: 'expp'

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

    as.data.frame

Quitting from lines 103-105 (expp.Rmd) 
Error: processing vignette 'expp.Rmd' failed with diagnostics:
unable to find an inherited method for function 'as.data.frame' for signature '"list"'
--- failed re-building 'expp.Rmd'

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

Error: Vignette re-building failed.
Execution halted