Ambiguous call?

[matkuki]

Hi,

can somebody help me make this compile? 
    
    
    import encodings
    
    proc parse_table(table_path: string) =
        var
            current_line: string
            encoder = encodings.open("UTF-8")
            f = open(table_path)
        defer: close(f)
    
    parse_table("testtable.txt")
    
    
    Run

<https://play.nim-lang.org/#ix=2FEA>

Thanks