Error(s) in re-building vignettes:
--- re-building 'PMCMR.Rnw' using Sweave
Loading required package: PMCMR
PMCMR is superseded by PMCMRplus and will be no longer maintained. You may wish to install PMCMRplus instead.
Warning in posthoc.kruskal.nemenyi.test.default(x = count, g = spray, dist = "Tukey") :
  Ties are present, p-values are not corrected.
Warning in posthoc.kruskal.nemenyi.test.default(c(10, 7, 20, 14, 14, 12,  :
  Ties are present, p-values are not corrected.
Warning in posthoc.kruskal.nemenyi.test.default(x = count, g = spray, dist = "Chisquare") :
  Ties are present. Chi-sq was corrected for ties.
The following objects are masked from InsectSprays (pos = 3):

    count, spray

Warning in posthoc.kruskal.dunn.test.default(x = count, g = spray, p.adjust.method = "none") :
  Ties are present. z-quantiles were corrected for ties.
The following objects are masked from InsectSprays (pos = 3):

    count, spray

The following objects are masked from InsectSprays (pos = 4):

    count, spray

Warning in posthoc.kruskal.dunn.test.default(x = count, g = spray, p.adjust.method = "bonferroni") :
  Ties are present. z-quantiles were corrected for ties.
The following objects are masked from InsectSprays (pos = 3):

    count, spray

The following objects are masked from InsectSprays (pos = 4):

    count, spray

The following objects are masked from InsectSprays (pos = 5):

    count, spray

Warning in posthoc.kruskal.conover.test.default(x = count, g = spray, p.adjust.method = "none") :
  Ties are present. Quantiles were corrected for ties.
The following objects are masked from InsectSprays (pos = 3):

    count, spray

The following objects are masked from InsectSprays (pos = 4):

    count, spray

The following objects are masked from InsectSprays (pos = 5):

    count, spray

The following objects are masked from InsectSprays (pos = 6):

    count, spray

Warning in posthoc.kruskal.conover.test.default(x = count, g = spray, p.adjust.method = "bonferroni") :
  Ties are present. Quantiles were corrected for ties.
Warning in dunn.test.control(x = weight, g = group, p.adjust = "bonferroni") :
  Ties are present. z-quantiles were corrected for ties.
The following objects are masked from InsectSprays (pos = 4):

    count, spray

The following objects are masked from InsectSprays (pos = 5):

    count, spray

The following objects are masked from InsectSprays (pos = 6):

    count, spray

The following objects are masked from InsectSprays (pos = 7):

    count, spray

The following objects are masked from InsectSprays (pos = 8):

    count, spray

The following objects are masked from InsectSprays (pos = 3):

    count, spray

The following objects are masked from InsectSprays (pos = 5):

    count, spray

The following objects are masked from InsectSprays (pos = 6):

    count, spray

The following objects are masked from InsectSprays (pos = 7):

    count, spray

The following objects are masked from InsectSprays (pos = 8):

    count, spray

The following objects are masked from InsectSprays (pos = 9):

    count, spray

Loading required package: multcompView
Warning in library(package, lib.loc = lib.loc, character.only = TRUE, logical.return = TRUE,  :
  there is no package called 'multcompView'
The following objects are masked from InsectSprays (pos = 3):

    count, spray

The following objects are masked from InsectSprays (pos = 4):

    count, spray

The following objects are masked from InsectSprays (pos = 6):

    count, spray

The following objects are masked from InsectSprays (pos = 7):

    count, spray

The following objects are masked from InsectSprays (pos = 8):

    count, spray

The following objects are masked from InsectSprays (pos = 9):

    count, spray

The following objects are masked from InsectSprays (pos = 10):

    count, spray

Warning in posthoc.kruskal.dunn.test.default(c(10, 7, 20, 14, 14, 12, 10,  :
  Ties are present. z-quantiles were corrected for ties.

Error: processing vignette 'PMCMR.Rnw' failed with diagnostics:
 chunk 26 
Error in multcompLetters(out.p, threshold = 0.05) : 
  could not find function "multcompLetters"

--- failed re-building 'PMCMR.Rnw'

SUMMARY: processing the following file failed:
  'PMCMR.Rnw'

Error: Vignette re-building failed.
Execution halted