Please help! I am stuck. This was just working last week! S.O.S. Thank you!

> library(oligo)

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’:

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

Loading required package: oligoClasses
Welcome to oligoClasses version 1.42.0
Loading required package: Biobase
Welcome to Bioconductor

    Vignettes contain introductory material; view with 'browseVignettes()'. To cite
    Bioconductor, see 'citation("Biobase")', and for packages 'citation("pkgname")'.

Loading required package: Biostrings
Loading required package: S4Vectors
Loading required package: stats4

Attaching package: ‘S4Vectors’

The following object is masked from ‘package:base’:

    expand.grid

Loading required package: IRanges

Attaching package: ‘IRanges’

The following object is masked from ‘package:grDevices’:

    windows

Loading required package: XVector

Attaching package: ‘Biostrings’

The following object is masked from ‘package:base’:

    strsplit

Error: package or namespace load failed for ‘oligo’ in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]):
 there is no package called ‘digest’

> celpath = "~/Documents/"
> data <- read.celfiles(list.celfiles())
Error in read.celfiles(list.celfiles()) : 
  could not find function "read.celfiles"

1) I am getting a new error at the end of loading package oligo: Error: package or namespace load failed for ‘oligo’ in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]):
 there is no package called ‘digest’

2) And also this is a new error Error in read.celfiles(list.celfiles()) : 
  could not find function "read.celfiles"

and I never had any problem with the argument 'read.celfiles(list.celfiles())' before

I am also seeing the same error 1) when I try to load my library separately using package 'affy' for the annotation package (miRNA-4_0-st-v1.cdf or pd.mirna.4.0)

Any time you see an error like

Error: package or namespace load failed for ‘oligo’ in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]):
 there is no package called ‘digest’

What it means is that you had an error because there isn't a required package called 'digest'. And the fix for that is to install that package!

library(BiocInstaller)

biocLite("digest")