I installed the GeneGA package but got an error message while trying the example: 

seqfile = system.file("sequence", "EGFP.fasta", package="GeneGA")
seq = unlist(getSequence(read.fasta(seqfile), as.string=TRUE))
GeneGA.result = GeneGA(sequence=seq, popSize=40, iters=100, crossoverRate=0.3, mutationChance=0.05, region=c(1,60))

This is the error message I get after the GeneGA.result:

The current generation is: 1 
Error in index02:index01 : argument of length 0

Someone else experienced a similar error while playing with the example (GeneGA Error Message). Does anyone know how to fix this error?

And here is my session Info. 

> 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 States.1252  LC_CTYPE=English_United States.1252    LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C                           LC_TIME=English_United States.1252    
attached base packages:
[1] stats4    parallel  stats     graphics  grDevices utils     datasets  methods   base     
other attached packages:
 [1] GeneGA_1.32.0       hash_2.2.6          seqinr_3.4-5        bindrcpp_0.2.2      R.utils_2.7.0       R.oo_1.22.0         R.methodsS3_1.7.1  
 [8] Peptides_2.4        forcats_0.3.0       stringr_1.3.1       dplyr_0.7.8         purrr_0.2.5         readr_1.3.0         tidyr_0.8.2        
[15] tibble_1.4.2        ggplot2_3.1.0       tidyverse_1.2.1     UniProt.ws_2.22.0   RCurl_1.95-4.11     bitops_1.0-6        RSQLite_2.1.1      
[22] data.table_1.11.8   Biostrings_2.50.1   XVector_0.22.0      IRanges_2.16.0      S4Vectors_0.20.1    BiocGenerics_0.28.0