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
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100 8141k  100 8141k    0     0  2550k      0  0:00:03  0:00:03 --:--:-- 2550k
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100 1373k  100 1373k    0     0   698k      0  0:00:01  0:00:01 --:--:--  698k
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100 1233k  100 1233k    0     0   603k      0  0:00:02  0:00:02 --:--:--  603k
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  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

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100 1870k  100 1870k    0     0   901k      0  0:00:02  0:00:02 --:--:--  901k
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  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
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100 3189k  100 3189k    0     0  1386k      0  0:00:02  0:00:02 --:--:-- 1386k
  % 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
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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