title: R cannot load package forecast due to namespace error
body: <p>I tried installing all the dependant packages and also tried another repo source as recommended in another post here. </p>
  
  <p>R version 3.2.0 x64</p>
  
  <pre><code>install.packages("fracdiff")
  install.packages("Rcpp")
  install.packages("RcppArmadillo") 
  install.packages("colorspace")
  install.packages("forecast", dep=T)
  install.packages("forecast", repos=c("http://cran.rstudio.com"),dep=T)
  library("forecast")
  </code></pre>
  
  <p>then I get</p>
  
  <pre><code>Loading required package: zoo 
  Attaching package: ‘zoo’
  The following objects are masked from ‘package:base’:
  as.Date, as.Date.numeric
  
  Loading required package: timeDate
  Error : .onAttach failed in attachNamespace() for 'forecast', details:
  call: fun(libname, pkgname)
  error: 4 arguments passed to .Internal(nchar) which requires 3
  In addition: Warning message:
  package ‘forecast’ was built under R version 3.2.1 
  Error: package or namespace load failed for ‘forecast’
  </code></pre>
  
  <p>sessionInfo()</p>
  
  <pre><code>R version 3.2.0 (2015-04-16)
  Platform: x86_64-w64-mingw32/x64 (64-bit)
  Running under: Windows 8 x64 (build 9200)
  
  locale:
  [1] LC_COLLATE=English_United States.1252  LC_CTYPE=English_United States.1252    LC_MONETARY=English_United States.1252 LC_NUMERIC=C                          
  [5] LC_TIME=English_United States.1252    
  
  attached base packages:
  [1] grid      stats     graphics  grDevices utils     datasets  methods   base     
  
  other attached packages:
  [1] Hmisc_3.16-0       ggplot2_1.0.1      Formula_1.2-1      survival_2.38-1    lattice_0.20-31    zoo_1.7-12         timeSeries_3012.99 timeDate_3012.100 
  
  loaded via a namespace (and not attached):
   [1] Rcpp_0.11.6         cluster_2.0.1       magrittr_1.5        MASS_7.3-41         splines_3.2.0       forecast_6.1        munsell_0.4.2      
   [8] colorspace_1.2-6    quadprog_1.5-5      stringr_1.0.0       plyr_1.8.3          tools_3.2.0         nnet_7.3-9          parallel_3.2.0     
  [15] gtable_0.1.2        latticeExtra_0.6-26 tseries_0.10-34     digest_0.6.8        gridExtra_0.9.1     RColorBrewer_1.1-2  reshape2_1.4.1     
  [22] acepack_1.3-3.3     rpart_4.1-9         fracdiff_1.4-2      stringi_0.4-1       scales_0.2.5        foreign_0.8-63      proto_0.3-10
  </code></pre>