okay it's a long story actually
for this particular cell, i did before a parasitic extraction , so i've previosly done,
Tools->Import Netlist->Enable in Analog Environment , and in order to be able to create the netlist from commande line, Import Netlist needs to be disabled actually.
that what i did, but with no sucess because once you enable "import netlist", CDF create a base parameter (importedFile) for your cell, which will not be deleted even though you disable the "import netlist" afterwards.
so you need to open CDF tool, and for your cell remove that parameter (importedFile), and it should work
I dont know in details , how those different tools interact, i just tried till it worked. may be somebody else can give us the details.