## load package
> library("rio")
> library("ledger")
> example_ledger_file <- system.file("extdata", "example.ledger", package = "ledger") 
> df <- rio::import(example_ledger_file)
Unrecognized file format. Try specifying with the format argument.
> df2 <- rio::import(example_ledger_file, format="ledger")
Unrecognized file format. Try specifying with the format argument.

## session info for your system
> sessionInfo()
R version 3.4.4 (2018-03-15)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 18.04.1 LTS

Matrix products: default
BLAS: /usr/lib/x86_64-linux-gnu/atlas/libblas.so.3.10.3
LAPACK: /usr/lib/x86_64-linux-gnu/atlas/liblapack.so.3.10.3

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8    
 [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8   
 [7] LC_PAPER=en_US.UTF-8       LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

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

other attached packages:
[1] rio_0.5.16     bindrcpp_0.2.2 ledger_2.0.0-1 tidyr_0.8.2    ggplot2_3.1.0 
[6] dplyr_0.7.8    usethis_1.4.0  devtools_2.0.1

loaded via a namespace (and not attached):
 [1] zip_1.0.0         Rcpp_1.0.0        cellranger_1.1.0  compiler_3.4.4   
 [5] pillar_1.3.0      plyr_1.8.4        bindr_0.1.1       forcats_0.3.0    
 [9] prettyunits_1.0.2 base64enc_0.1-3   remotes_2.0.2     tools_3.4.4      
[13] testthat_2.0.1    digest_0.6.18     pkgbuild_1.0.2    pkgload_1.0.2    
[17] memoise_1.1.0     tibble_1.4.2      gtable_0.2.0      debugme_1.1.0    
[21] pkgconfig_2.0.2   rlang_0.3.0.1     openxlsx_4.1.0    cli_1.0.1        
[25] curl_3.2          haven_1.1.2       withr_2.1.2       hms_0.4.2        
[29] rappdirs_0.3.1    desc_1.2.0        fs_1.2.6          rprojroot_1.3-2  
[33] grid_3.4.4        tidyselect_0.2.5  data.table_1.11.4 glue_1.3.0       
[37] R6_2.3.0          processx_3.2.0    readxl_1.1.0      foreign_0.8-71   
[41] sessioninfo_1.1.1 callr_3.0.0       purrr_0.2.5       magrittr_1.5     
[45] backports_1.1.2   scales_1.0.0      ps_1.2.1          assertthat_0.2.0 
[49] colorspace_1.3-2  lazyeval_0.2.1    munsell_0.5.0     crayon_1.3.4