NbClust - Error: cannot select x size vector

Question

NbClust - Error: cannot select x size vector

I am running a k-average clustering in R and would like to use NbClustit to help determine the optimal number of clusters. My dataset dfcontains 636,688 rows and 7 columns.

When I run NbClust(df, min.nc = 2, max.nc = 3, method = "kmeans"), I get:

Error: cannot allocate vector of size 1510.1 Gb
In addition: Warning messages:
1: In dist(jeu, method = "euclidean") :
  Reached total allocation of 32767Mb: see help(memory.size)
2: In dist(jeu, method = "euclidean") :
  Reached total allocation of 32767Mb: see help(memory.size)
3: In dist(jeu, method = "euclidean") :
  Reached total allocation of 32767Mb: see help(memory.size)
4: In dist(jeu, method = "euclidean") :
  Reached total allocation of 32767Mb: see help(memory.size)

Here is mine sessionInfo:

R version 3.0.2 (2013-09-25)
Platform: x86_64-w64-mingw32/x64 (64-bit)

locale:
[1] LC_COLLATE=English_United Kingdom.1252  LC_CTYPE=English_United Kingdom.1252    LC_MONETARY=English_United Kingdom.1252
[4] LC_NUMERIC=C                            LC_TIME=English_United Kingdom.1252    

attached base packages:
[1] stats4    grid      stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
 [1] clusterSim_0.43-3 fpc_2.1-6         flexmix_2.3-11    mclust_4.2        cluster_1.14.4    MASS_7.3-29      
 [7] flexclust_1.3-4   modeltools_0.2-21 lattice_0.20-23   NbClust_1.4       rattle_2.6.26    

loaded via a namespace (and not attached):
[1] ade4_1.6-2     class_7.3-9    e1071_1.6-2    nnet_7.3-7     parallel_3.0.2 R2HTML_2.2.1   rgl_0.93.996   tools_3.0.2