Whats does Error [17] mean?

[Hepit]

Hello,

I'm attempting to generate summary statistics with MetaSKAT using the tutorial linked in the vignette (https://cran.r-project.org/web/packages/MetaSKAT/vignettes/MetaSKAT.pdf). However when doing so, I get a rather vague error. Here's what gets printed:

Read SetID file
SetID file has419sets
Read Bim file
Bim file has494820markers
Merge datasets and get set info
Error in Print_Error_CODE(error_code) : Error [17]
Calls: Generate_Meta_Files ... Generate_Meta_Files_Work -> Read_From_BED_File -> Print_Error_CODE

Any insight on what the problem might be? As far as I can tell, my bfile is not misformatted, and plink can use it just fine.

Thanks !