getPsModel hanging

[edward-burn]

Hi, I'm currently working through the single study vignette using Synpuf data. When I get to
propensityModel <- getPsModel(ps, cohortMethodData)
it gets no further than:
"Removing infrequent covariates
Removing infrequent covariates took 2.25 secs
Normalizing covariates
Normalizing covariates took 1.88 secs
Removing redundant covariates
Removing redundant covariates took 2.13 secs"

It just freezes with no error message

[edward-burn]

sessionInfo()
R version 3.5.1 (2018-07-02)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows >= 8 x64 (build 9200)

Matrix products: default

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

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

other attached packages:
[1] CohortMethod_3.0.2 FeatureExtraction_2.2.1 Cyclops_2.0.2
[4] DatabaseConnector_2.3.0

loaded via a namespace (and not attached):
[1] Rcpp_0.12.18 plyr_1.8.4 compiler_3.5.1
[4] prettyunits_1.0.2 remotes_2.0.2 tools_3.5.1
[7] bit_1.1-14 testthat_2.0.0 digest_0.6.15
[10] pkgbuild_1.0.2 pkgload_1.0.2 memoise_1.1.0
[13] lattice_0.20-35 ff_2.2-14 rlang_0.2.1
[16] fastmatch_1.1-0 Matrix_1.2-14 DBI_1.0.0
[19] cli_1.0.0 rstudioapi_0.7 curl_3.2
[22] yaml_2.1.19 rJava_0.9-10 withr_2.1.2
[25] desc_1.2.0 fs_1.2.6 devtools_2.0.1
[28] rprojroot_1.3-2 grid_3.5.1 ffbase_0.12.7
[31] glue_1.3.0 R6_2.2.2 processx_3.1.0
[34] survival_2.42-3 sessioninfo_1.1.1 ParallelLogger_1.1.0
[37] SqlRender_1.6.1 callr_2.0.4 magrittr_1.5
[40] backports_1.1.2 MASS_7.3-50 splines_3.5.1
[43] usethis_1.4.0 assertthat_0.2.0 RcppParallel_4.4.1
[46] crayon_1.3.4