Does anyone know about error message below after blockwiseModule().

> net = blockwiseModules(datExpr, power = 6,
+                        TOMType = "unsigned", minModuleSize = 30,
+                        reassignThreshold = 0, mergeCutHeight = 0.25,
+                        numericLabels = TRUE, pamRespectsDendro = FALSE,
+                        saveTOMs = TRUE,
+                        saveTOMFileBase = "femaleMouseTOM", 
+                        verbose = 3)
 Calculating module eigengenes block-wise fro

 *** caught segfault ***
address 0x0, cause 'memory not mapped'

Traceback:
 1: .Call("tomSimilarity_call", selExpr, as.integer(CcorType), as.integer(CnetworkType),     as.double(power), as.integer(CTOMType), as.integer(TOMDenomC),     as.double(maxPOutliers), as.double(quickCor), as.integer(fallback),     as.integer(cosineCorrelation), warn, as.integer(nThreads),     as.integer(callVerb), as.integer(callInd), PACKAGE = "WGCNA")
 2: blockwiseModules(datExpr, power = 6, TOMType = "unsigned", minModuleSize = 30,     reassignThreshold = 0, mergeCutHeight = 0.25, numericLabels = TRUE,     pamRespectsDendro = FALSE, saveTOMs = TRUE, saveTOMFileBase = "femaleMouseTOM",     verbose = 3)

Possible actions:
1: abort (with core dump, if enabled)
2: normal R exit
3: exit R without saving workspace
4: exit R saving workspace

Attached the result of sessionInfo()

> sessionInfo()
R version 3.4.0 (2017-04-21)
Platform: x86_64-apple-darwin15.6.0 (64-bit)
Running under: macOS Sierra 10.12.4

Matrix products: default
BLAS: /Library/Frameworks/R.framework/Versions/3.4/Resources/lib/libRblas.0.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/3.4/Resources/lib/libRlapack.dylib

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

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

other attached packages:
[1] WGCNA_1.49            fastcluster_1.1.22    dynamicTreeCut_1.63-1 RcmdrMisc_1.0-5       sandwich_2.3-4       
[6] car_2.1-4     

Thanks for the bug report. It is difficult to say what the problem is apart from the obvious conclusion that it happens somewhere in the compiled code of WGCNA calculations. Try installing the newest WGCNA version and see if the problem persists.