Command "generate p p > t t~ WEIGHTED=4" interrupted with error (MGC v3.3.1)

[sragons2]

Hi,

I get the following error message in madgraph : Command "generate p p > t t~ WEIGHTED=4" interrupted with error:
InvalidCmd : model order WEIGHTED not valid for this model (valid one are: QCD, QED, EW, EW^2, aEW, aS). Please correct

What I do not understand is that the command worked fine with 2.9.9, and now that I have uninstalled this version and now use the version 3.1.1, it does not work anymore.

Any advice, please ?

Thanks