Error when running addPercentMtRibo

[rpolicastro]

Running addPercentMtRibo on a Seurat v3 object produces an error.

seurat <- addPercentMtRibo(seurat, organism="hg", gene_nomenclature="name")
Error: Unknown TZ UTC

R version 3.5.1 (2018-07-02)
Platform: x86_64-conda_cos6-linux-gnu (64-bit)
Running under: Red Hat Enterprise Linux Server 7.5 (Maipo)

Matrix products: default
BLAS/LAPACK: /gpfs/home/r/p/rpolicas/Carbonate/.conda/envs/cerebro/lib/R/lib/libRblas.so

locale:
[1] C

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

other attached packages:
[1] cerebroPrepare_1.0.0 Seurat_3.0.0        

loaded via a namespace (and not attached):
 [1] httr_1.4.0          tidyr_0.8.3         jsonlite_1.6       
 [4] viridisLite_0.3.0   splines_3.5.1       lsei_1.2-0         
 [7] R.utils_2.8.0       gtools_3.8.1        Rdpack_0.11-0      
[10] assertthat_0.2.1    ggrepel_0.8.1       globals_0.12.4     
[13] pillar_1.3.1        lattice_0.20-38     reticulate_1.12    
[16] glue_1.3.1          digest_0.6.18       RColorBrewer_1.1-2 
[19] SDMTools_1.1-221.1  colorspace_1.4-1    cowplot_0.9.4      
[22] htmltools_0.3.6     Matrix_1.2-17       R.oo_1.22.0        
[25] plyr_1.8.4          pkgconfig_2.0.2     bibtex_0.4.2       
[28] tsne_0.1-3          listenv_0.7.0       purrr_0.3.2        
[31] scales_1.0.0        RANN_2.6.1          gdata_2.18.0       
[34] Rtsne_0.15          tibble_2.1.1        ggplot2_3.1.1      
[37] ROCR_1.0-7          pbapply_1.4-0       lazyeval_0.2.2     
[40] survival_2.44-1.1   magrittr_1.5        crayon_1.3.4       
[43] R.methodsS3_1.7.1   future_1.13.0       nlme_3.1-139       
[46] MASS_7.3-51.4       gplots_3.0.1.1      ica_1.0-2          
[49] tools_3.5.1         fitdistrplus_1.0-14 data.table_1.12.2  
[52] hms_0.4.2           gbRd_0.4-11         stringr_1.4.0      
[55] plotly_4.9.0        munsell_0.5.0       cluster_2.0.9      
[58] irlba_2.3.3         compiler_3.5.1      rsvd_1.0.0         
[61] caTools_1.17.1.2    rlang_0.3.4         grid_3.5.1         
[64] ggridges_0.5.1      htmlwidgets_1.3     igraph_1.2.4.1     
[67] bitops_1.0-6        npsurv_0.4-0        gtable_0.3.0       
[70] codetools_0.2-16    reshape2_1.4.3      R6_2.4.0           
[73] gridExtra_2.3       zoo_1.8-5           dplyr_0.8.0.1      
[76] future.apply_1.2.0  readr_1.3.1         KernSmooth_2.23-15 
[79] metap_1.1           ape_5.3             stringi_1.4.3      
[82] parallel_3.5.1      Rcpp_1.0.1          sctransform_0.2.0  
[85] png_0.1-7           tidyselect_0.2.5    lmtest_0.9-37