[FEATURE] drawModules documentation: Failed to connect to localhost

[viallonv]

Describe the bug
When calling the drawModules function, I get the following message, and error:
Cytoscape output could take a few minutes...
Error in curl::curl_fetch_memory(url, handle = handle) :
Failed to connect to localhost port 1234: Connection refused

Environment (please complete the following information):
R version 3.5.2 (2018-12-20)
Platform: x86_64-apple-darwin15.6.0 (64-bit)
Running under: OS X El Capitan 10.11.6

Matrix products: default
BLAS: /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/3.5/Resources/lib/libRlapack.dylib

locale:
[1] fr_FR.UTF-8/fr_FR.UTF-8/fr_FR.UTF-8/C/fr_FR.UTF-8/fr_FR.UTF-8

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

other attached packages:
[1] nlme_3.1-140 hglm_2.2-1 hglm.data_1.0-1 sp_1.3-1
[5] MASS_7.3-51.4 Matrix_1.2-17 reshape2_1.4.3 openxlsx_4.1.0.1
[9] foreach_1.4.4 haven_2.1.1 forcats_0.4.0 stringr_1.4.0
[13] dplyr_0.8.1 purrr_0.3.2 readr_1.3.1 tidyr_0.8.3
[17] tibble_2.1.3 ggplot2_3.2.0 tidyverse_1.2.1 MoDentify_0.99.0
[21] BiocParallel_1.16.6 igraph_1.2.4.1 data.table_1.12.2

loaded via a namespace (and not attached):
[1] colorspace_1.4-1 rprojroot_1.3-2 htmlTable_1.13.1 corpcor_1.6.9
[5] base64enc_0.1-3 fs_1.3.1 rstudioapi_0.10 remotes_2.1.0
[9] longitudinal_1.1.12 fansi_0.4.0 lubridate_1.7.4 xml2_1.2.0
[13] codetools_0.2-16 splines_3.5.2 R.methodsS3_1.7.1 knitr_1.23
[17] pkgload_1.0.2 zeallot_0.1.0 Formula_1.2-3 jsonlite_1.6
[21] broom_0.5.2 cluster_2.1.0 R.oo_1.22.0 graph_1.60.0
[25] compiler_3.5.2 httr_1.4.0 backports_1.1.4 assertthat_0.2.1
[29] lazyeval_0.2.2 cli_1.1.0 acepack_1.4.1 htmltools_0.3.6
[33] prettyunits_1.0.2 tools_3.5.2 gtable_0.3.0 glue_1.3.1
[37] Rcpp_1.0.2 cellranger_1.1.0 vctrs_0.2.0 RJSONIO_1.3-1.2
[41] iterators_1.0.10 gbRd_0.4-11 xfun_0.8 RCy3_2.2.9
[45] ps_1.3.0 testthat_2.1.1 rvest_0.3.4 devtools_2.0.2
[49] XML_3.98-1.20 scales_1.0.0 hms_0.5.1 parallel_3.5.2
[53] GeneNet_1.2.13 RColorBrewer_1.1-2 curl_4.0 memoise_1.1.0
[57] gridExtra_2.3 rpart_4.1-15 latticeExtra_0.6-28 stringi_1.4.3
[61] desc_1.2.0 checkmate_1.9.3 BiocGenerics_0.28.0 zip_2.0.4
[65] pkgbuild_1.0.3 bibtex_0.4.2 Rdpack_0.11-0 rlang_0.4.0
[69] pkgconfig_2.0.2 lattice_0.20-38 htmlwidgets_1.3 processx_3.3.1
[73] tidyselect_0.2.5 plyr_1.8.4 magrittr_1.5 R6_2.4.0
[77] generics_0.0.2 Hmisc_4.2-0 pillar_1.4.2 foreign_0.8-71
[81] withr_2.1.2 survival_2.44-1.1 nnet_7.3-12 modelr_0.1.4
[85] crayon_1.3.4 fdrtool_1.2.15 utf8_1.1.4 usethis_1.5.0
[89] grid_3.5.2 readxl_1.3.1 callr_3.2.0 digest_0.6.20
[93] R.utils_2.9.0 stats4_3.5.2 munsell_0.5.0 sessioninfo_1.1.1

[Livia-Rasp]

To Do
Make it clearer in the documentation that Cytoscape has to be openend. for the method to work, i.e. write it in the roxygen documentation and maybe also the README file.