ivreghdfe's error: virtual Factor::drop_singletons() not found

[Du Nguyen]

Dear Statalists,

I'm trying to run ivreghdfe but run across an error that I failed to find any online solutions. I wonder if Sergio Correia could help identify the issue. My Stata version is MP 14.0. Thank you.

cap ado uninstall reghdfe
cap ado uninstall ivreghdfe
cap ado uninstall ivreg2
cap ado uninstall ftools
ssc install ftools
ssc install reghdfe
ssc install ivreg2
ssc install ivreghdfe

sysuse auto, clear
(1978 Automobile Data)

ivreghdfe price weight (length=gear), absorb(turn trunk)
         fixed_effects():  3499  virtual Factor::drop_singletons() not found
                 <istmt>:     -  function returned error
r(3499);