Reweighting does not know set command

Dear all,

I am trying to generate ee (or pp) events with aTGCs using the reweighting method. However this does not work, saying:
INFO: Running Reweight
launch
INFO: detected model: sm. Loading...
INFO: generating the square matrix element for reweighting
INFO: generate p p > e+ ve mu- vm~ ;
INFO: Done 6.009
set Dim6 1 10
WARNING: invalid set command Dim6 1 10
set Dim6 2 0
WARNING: invalid set command Dim6 2 0
set Dim6 3 0
WARNING: invalid set command Dim6 3 0

I am using: MG5_aMC_v2_2_3

and am running the following script:
./bin/mg5_aMC script.mg5

#***********script.py

set group_subprocesses Auto
set ignore_six_quark_processes False
set loop_optimized_output True
set gauge unitary
set complex_mass_scheme False
import model sm
define p = g u c d s u~ c~ d~ s~
define j = g u c d s u~ c~ d~ s~
define l+ = e+ mu+
define l- = e- mu-
define vl = ve vm vt
define vl~ = ve~ vm~ vt~
generate p p > e+ ve mu- vm~
output WW_testpp1

launch
reweight=ON
./reweight_card.dat

set lpp1 1
set lpp2 1

set nevents 1000
set iseed 1234

set ebeam2 3500
set ebeam1 3500

the reweighting

#***********reweight_card.dat
launch
set Dim6 1 10
set Dim6 2 0
set Dim6 3 0

I am supecting, there is something wrong in the script file. It would be great, if you could have a look.
(Also: Is it possible, to get e.g. not EFT operators but also the LEP ones, i.e. gZ and gKappa?)

thanks & best
Kristin