Error(s) in re-building vignettes:
--- re-building 'cem.Rnw' using Sweave
Loading required package: cem
Loading required package: tcltk
Loading required package: lattice

How to use CEM? Type vignette("cem")

Warning in dist(data[idx2, obj$vars], method = method, p = mpower) :
  NAs introduced by coercion
Warning in dist(data[idx2, obj$vars], method = method, p = mpower) :
  NAs introduced by coercion
Warning in dist(data[idx2, obj$vars], method = method, p = mpower) :
  NAs introduced by coercion
Warning in dist(data[idx2, obj$vars], method = method, p = mpower) :
  NAs introduced by coercion
Warning in dist(data[idx2, obj$vars], method = method, p = mpower) :
  NAs introduced by coercion
Warning in min(x, na.rm = TRUE) :
  no non-missing arguments to min; returning Inf
Warning in dist(data[idx2, obj$vars], method = method, p = mpower) :
  NAs introduced by coercion
Warning in dist(data[idx2, obj$vars], method = method, p = mpower) :
  NAs introduced by coercion
Warning in dist(data[idx2, obj$vars], method = method, p = mpower) :
  NAs introduced by coercion
Warning in min(x, na.rm = TRUE) :
  no non-missing arguments to min; returning Inf
Warning in dist(data[idx2, obj$vars], method = method, p = mpower) :
  NAs introduced by coercion
Warning in dist(data[idx2, obj$vars], method = method, p = mpower) :
  NAs introduced by coercion
Warning in dist(data[idx2, obj$vars], method = method, p = mpower) :
  NAs introduced by coercion
Warning in dist(data[idx2, obj$vars], method = method, p = mpower) :
  NAs introduced by coercion
Warning in dist(data[idx2, obj$vars], method = method, p = mpower) :
  NAs introduced by coercion
Warning in dist(data[idx2, obj$vars], method = method, p = mpower) :
  NAs introduced by coercion
Warning in dist(data[idx2, obj$vars], method = method, p = mpower) :
  NAs introduced by coercion
Warning in min(x, na.rm = TRUE) :
  no non-missing arguments to min; returning Inf
Warning in dist(data[idx2, obj$vars], method = method, p = mpower) :
  NAs introduced by coercion
Warning in dist(data[idx2, obj$vars], method = method, p = mpower) :
  NAs introduced by coercion
Warning in dist(data[idx2, obj$vars], method = method, p = mpower) :
  NAs introduced by coercion
Warning in dist(data[idx2, obj$vars], method = method, p = mpower) :
  NAs introduced by coercion
Warning in dist(data[idx2, obj$vars], method = method, p = mpower) :
  NAs introduced by coercion
Warning in dist(data[idx2, obj$vars], method = method, p = mpower) :
  NAs introduced by coercion
Warning in dist(data[idx2, obj$vars], method = method, p = mpower) :
  NAs introduced by coercion
Warning in dist(data[idx2, obj$vars], method = method, p = mpower) :
  NAs introduced by coercion
Warning in dist(data[idx2, obj$vars], method = method, p = mpower) :
  NAs introduced by coercion
Warning in dist(data[idx2, obj$vars], method = method, p = mpower) :
  NAs introduced by coercion
Warning in min(x, na.rm = TRUE) :
  no non-missing arguments to min; returning Inf
Loading required package: Amelia
Loading required package: Rcpp
Error: package or namespace load failed for 'Rcpp' in library.dynam(lib, package, package.lib):
 DLL 'Rcpp' not found: maybe not installed for this architecture?
Failed with error:  'package 'Rcpp' could not be loaded'

Error: processing vignette 'cem.Rnw' failed with diagnostics:
 chunk 36 
Error in amelia(LeLonde, noms = c("black", "hispanic", "treated", "married",  : 
  could not find function "amelia"

--- failed re-building 'cem.Rnw'

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

Error: Vignette re-building failed.
Execution halted