Ciao Francesco, this seems very strange, as the Cannot allocate memory error comes from python checking g++ — version, which you told me works from command line… can you try nevertheless to run from the folder you have exported, ‘ignoring’ the error? then, on lxplus, have you configured your OS variables as suggested here? http://amcatnlo.web.cern.ch/amcatnlo/list_detailed2.htm#dependencies let me know, Cheers, Marco On 25 Jan 2015, at 02:29, Francesco Giuli