Error: package or namespace load failed for ‘oligoClasses’: objects ‘open.ff’, ‘close.ff’ are not exported by 'namespace:ff'

[SergioAlonsoLab]

Dear developers,
I'm having problems to install oligoClasses, that depends on ff.
Same problem when trying on Mac OS X 10.14.6 and Linux Debian 10

I tried the standard procedure:
BiocManager::install("oligoClasses")

But when trying to load the library, I get the following error:
Error: package or namespace load failed for ‘oligoClasses’: objects ‘open.ff’, ‘close.ff’ are not exported by 'namespace:ff'

It seems that the problem originates in ff.
I'm running R version 4.0.2 (2020-06-22)
In fact, open.ff or close.ff functions are not visible in ff package, despite they appear in the ff package manual. I'm not sure if they should be explicitly visible for oligoClasses to run, or just open and close functions from base are enough.

I'm writing the same question here and in the ff repository issues tab.
My apologies if the question should not be directed here.

Best regards,
Sergio

[SergioAlonsoLab]

Follow up on this issue,
the updated version of ff does not export S3 methods.
See the response from Jens Oehlschlägel, one of the developers of ff:

truecluster/ff#2 (comment)

Perhaps there is a quick fix for oligoClasses to not rely on the S3 methods previously exported by ff

Best regards,
Sergio Alonso

[jeremycfd]

I have also run into this issue. Thanks for providing the link to ff workaround.