Solving “Error: object ‘is.factor.ff’ is not exported by 'namespace:ff'”

[schuemie (Martijn Schuemie)]

A lot of people have reported this error message: "Error: object ‘is.factor.ff’ is not exported by 'namespace:ff'” when trying to run older versions of the OHDSI R packages. This appears to be caused by inconsistencies between the new version of ff and ffbase.

The best solution is to upgrade to the newer OHDSI packages, where we have replaced ff with Andromeda.

However, if you’re stuck with the old packages, here’s how to downgrade ff to solve the problem:

library(devtools)
Sys.setenv("R_REMOTES_NO_ERRORS_FROM_WARNINGS"=TRUE)
install_version("ff", version = "2.2-14", repos = "http://cran.us.r-project.org")

[William]

Hi Schuemie,
How to upgrade to the newer OHDSI packages?
I downloaded my packages directly from the PLP in Atlas, so I can have all my setup info in the packages.
Thanks!
William

[jposada (Jose Posada)]

hi @William,

I believe the answer to your question is in this post

How to use the latest version of HADES in new study packages generated by ATLAS

As most of you know, you can generate estimation and prediction study packages directly from ATLAS. However, the current version of ATLAS is lagging behind a bit in the versions of the HADES packages used in the generated study packages. Most importantly, the study packages generated by ATLAS still use ff, even though we migrated to Andromeda for good reasons a while ago. If you want to use the latest versions of the study packages (which use the latest version of the HADES packages), you can g…