Error(s) in re-building vignettes:
--- re-building ‘rredis.Rnw’ using Sweave
Error: processing vignette 'rredis.Rnw' failed with diagnostics:
Running 'texi2dvi' on 'rredis.tex' failed.
LaTeX errors:
! Undefined control sequence.
l.127 \htmladdnormallink
                        {https://github.com/MSOpenTech/redis}{https://github...
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
! Undefined control sequence.
l.140 \htmladdnormallink
                        {http://redis.io}{http://redis.io}, with source code
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
! Undefined control sequence.
l.142 \htmladdnormallink
                        {http://github.com/antirez/redis}{http://github.com/...
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
! Undefined control sequence.
l.548 \htmladdnormallink
                        {http://redis.io/commands}{http://redis.io/commands}.
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
! Undefined control sequence.
l.603 \htmladdnormallink
                        {http://redis.io/commands}{http://redis.io/commands}:
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
! Undefined control sequence.
l.640 \htmladdnormallink
                        {https://github.com/redis/hiredis}{https://github.co...
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
! Undefined control sequence.
l.668 \htmladdnormallink
                        {https://github.com/eddelbuettel/rhiredis}{https://g...
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
! Undefined control sequence.
l.669 \htmladdnormallink
                        {https://github.com/wush978/rredis}{https://github.c...
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
! Undefined control sequence.
l.677 \htmladdnormallink
                        {http://redis.io}{http://redis.io}:
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
--- failed re-building ‘rredis.Rnw’

SUMMARY: processing the following file failed:
  ‘rredis.Rnw’

Error: Vignette re-building failed.
Execution halted