error in bed_flank vignette example

[jayhesselberth]

Error: Duplicate identifiers for rows (1284808, 1498582), (3284808, 3498582), (1386858, 1732629), (3386858, 3732629), (1136478, 1735205), (3136478, 3735205), (1256268, 1422468), (3256268, 3422468), (1298131, 1653327), (3298131, 3653327), (1628578, 1849474), (3628578, 3849474), (284808, 498582), (2284808, 2498582), (386858, 732629), (2386858, 2732629), (136478, 735205), (2136478, 2735205), (256268, 422468), (2256268, 2422468), (298131, 653327), (2298131, 2653327), (628578, 849474), (2628578, 2849474)
8. stop("Duplicate identifiers for rows ", paste(str, collapse = ", "), call. = FALSE)
7. spread_.data.frame(data, key_col, value_col, fill = fill, convert = convert, drop = drop, sep = sep)
6. NextMethod()
5. as_data_frame(NextMethod())
4. spread_.tbl_df(data, key_col, value_col, fill = fill, convert = convert, drop = drop, sep = sep)
3. spread_(data, key_col, value_col, fill = fill, convert = convert, drop = drop, sep = sep)
2. tidyr::spread(res, key, value) at bed_flank.r#121
1. bed_flank(x, genome, both = 100)