Just browsing some G'mic filters on "Contours"and found these errors (I did update the filters definitions via Internet).

Environment: Gimp 2.10.24 rev.3 + G'mic 2.9.7

Your version of G'mic has issues, try another. All three filters work here in G'mic 2.9.8

The gmic_gimp_qt syntax is frequently changing and breaking filters.
Some times better to go back a stable version and check if the required filters work. Latest (today) I found with my compiled plugin 2.9.8 , the 'finger paint' filter not working. Compiled it again with latest code and that is working again. But with 405 filters + another 163 in 'testing' you might never find the broken ones until you need them. David will fix in the main section when informed but 'testing' is another matter.

Thanks.
Usually (not always) I prefer to keep on a "stable" version, and currently 2.9.7 is the "stable" one


Maybe I will move up to the pre-release.

Thanks Rich, I just posted those info for David, he may check whether there is a need for fixes or whether all have been aleady done in 2.9.8.

post-scriptum:

following the info provided by racer-x, I downloaded the pre-release 2.9.8; those filters work, hence the problems have been fixed already there. Thanks.

dinasset, you downloaded this one which contains these folders?

NO, the gmic_gimp2.10_win64.zip I downloaded includes only gmic_gimp_qt.
If you use Samj's package, go to Preferences/plug-ins, rename the existing gmic_gimp_qt in something like gmic_gimp_qt-OLD, then place there the gmic_gimp_qt you just downloaded from gmic.eu.

thank you dinasset, I will rename with the number as you explained to me before.