package 'corpus' not available?

Dear All,
I am trying to submit a minor update of new package (GenEst) to CRAN, but
got an error that has not appeared in releases earlier this year (the
latest was two weeks ago):

* checking package dependencies ... ERROR
Package required but not available: ?corpus?

I see the package on CRAN, and it installs and runs fine on my machine.
Since its last release, my package has not had any changes that involve
'corpus' functions, the 'corpus' package at CRAN has not changed, and R is
still 3.5.1. Any ideas about what might be going on?

Any help would be greatly appreciated!

-Dan

Dan Dalthorp, PhD
USGS Forest and Rangeland Ecosystem Science Center
Forest Sciences Lab, Rm 311
3200 SW Jefferson Way
Corvallis, OR 97331
ph: 541-750-0953
ddalthorp at usgs.gov

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