How do i look into this runtime-failure?

[Hobbyman]

The only error-info I get is this:
    
    
    Hint: mypath/g_mine [Exec]
    mypath/g_mine.nim(1198) g_mine
    /home/user/.choosenim/toolchains/nim-2.0.0/lib/std/assertions.nim(25) 
getChildLinks
    /home/user/.choosenim/toolchains/nim-2.0.0/lib/system/fatal.nim(53) sysFatal
    Error: unhandled exception: index 1 not in 0 .. 0 [IndexDefect]
    Error: execution of an external program failed: 'mypath/g_mine'
    
    
    Run

Only the called procedure (getChildLinks) is mentioned, not where in the 
procedure things go wrong (line-number), nor the variables involved.. Has 
anybody ideas how to get more info?

TIA (thanks in advance)... :-)