Error in re-building vignettes:
  ...
Loading required package: GenomicRanges
Loading required package: stats4
Loading required package: BiocGenerics
Loading required package: parallel

Attaching package: 'BiocGenerics'

The following objects are masked from 'package:parallel':

    clusterApply, clusterApplyLB, clusterCall, clusterEvalQ,
    clusterExport, clusterMap, parApply, parCapply, parLapply,
    parLapplyLB, parRapply, parSapply, parSapplyLB

The following objects are masked from 'package:stats':

    IQR, mad, sd, var, xtabs

The following objects are masked from 'package:base':

    Filter, Find, Map, Position, Reduce, anyDuplicated, append,
    as.data.frame, cbind, colMeans, colSums, colnames, do.call,
    duplicated, eval, evalq, get, grep, grepl, intersect,
    is.unsorted, lapply, lengths, mapply, match, mget, order,
    paste, pmax, pmax.int, pmin, pmin.int, rank, rbind, rowMeans,
    rowSums, rownames, sapply, setdiff, sort, table, tapply,
    union, unique, unsplit, which, which.max, which.min

Loading required package: S4Vectors

Attaching package: 'S4Vectors'

The following object is masked from 'package:base':

    expand.grid

Loading required package: IRanges
Loading required package: GenomeInfoDb
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
  0 8141k    0 57682    0     0  57682      0  0:02:24  0:00:01  0:02:23 46330
  6 8141k    6  555k    0     0   277k      0  0:00:29  0:00:02  0:00:27  254k
 40 8141k   40 3294k    0     0  1098k      0  0:00:07  0:00:03  0:00:04 1039k
100 8141k  100 8141k    0     0  2713k      0  0:00:03  0:00:03 --:--:-- 2140k
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
  0 1373k    0  7002    0     0   7002      0  0:03:20 --:--:--  0:03:20 21412
 19 1373k   19  272k    0     0   272k      0  0:00:05  0:00:01  0:00:04  203k
 95 1373k   95 1306k    0     0   653k      0  0:00:02  0:00:02 --:--:--  579k
100 1373k  100 1373k    0     0   686k      0  0:00:02  0:00:02 --:--:--  580k
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
  8 1233k    8   98k    0     0    98k      0  0:00:12 --:--:--  0:00:12  116k
 66 1233k   66  822k    0     0   822k      0  0:00:01  0:00:01 --:--:--  426k
100 1233k  100 1233k    0     0   616k      0  0:00:02  0:00:02 --:--:--  596k
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
  2 3007k    2 62026    0     0  62026      0  0:00:49 --:--:--  0:00:49 86387
 16 3007k   16  486k    0     0   486k      0  0:00:06  0:00:01  0:00:05  288k
 74 3007k   74 2253k    0     0  1126k      0  0:00:02  0:00:02 --:--:--  849k
100 3007k  100 3007k    0     0  1503k      0  0:00:02  0:00:02 --:--:-- 1076k
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
  4 1870k    4 95330    0     0  95330      0  0:00:20 --:--:--  0:00:20  108k
 35 1870k   35  657k    0     0   657k      0  0:00:02  0:00:01  0:00:01  365k
100 1870k  100 1870k    0     0   935k      0  0:00:02  0:00:02 --:--:--  800k
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
  0 3189k    0  7002    0     0   7002      0  0:07:46 --:--:--  0:07:46 19450
 10 3189k   10  344k    0     0   344k      0  0:00:09  0:00:01  0:00:08  235k
 56 3189k   56 1808k    0     0   904k      0  0:00:03  0:00:02  0:00:01  742k
100 3189k  100 3189k    0     0  1594k      0  0:00:02  0:00:02 --:--:-- 1174k
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100   269  100   269    0     0    269      0  0:00:01 --:--:--  0:00:01   832
Quitting from lines 136-146 (my-vignette.Rmd) 
Error: processing vignette ‘my-vignette.Rmd’ failed with diagnostics:
attempt to set an attribute on NULL
Execution halted