reghdfe update and "function cleanup_before_saving() not declared in class Factor" error

[JanDitzen]

I recently update reghdfe to the august 2023 version (6.12) from SSC. When I try to use reghdfe the following error occurs:

function cleanup_before_saving() not declared in class Factor

The error occurs on Stata 17 and 18. I also removed (by hand) mata libraries of former versions, but the error persists.

I haven't read about the error so far, so I am wondering if anyone else had a similar issue.

[JanDitzen]

Sergio answered on GitHub (https://github.com/sergiocorreia/reghdfe/issues/277). I was missing an update of ftools.

[Hua Peng (StataCorp)]

Crossed with #2

I ran into same issue and fixed by following Sergio's instrunction for version 6.x http://scorreia.com/software/reghdfe/install.html

The important step is installing latest ftool then 6.x

 * Install ftools (remove program if it existed previously)
cap ado uninstall ftools
net install ftools, from("https://raw.githubusercontent.com/sergiocorreia/ftools/master/src/")    
 * Install reghdfe 6.x
cap ado uninstall reghdfe
net install reghdfe, from("https://raw.githubusercontent.com/sergiocorreia/reghdfe/master/src/")