Configure environment (Sencha Touch 2.1)

Hi everyone! We have a machine with Windows 7 running and sencha touch 2.1 commercial package, and we need configure the environment to run sencha commands to create and build production app. Actually, it's already exists a installation of sencha touch on this machine. When I try run the command: C:\Fontes\Ecolivery\Doran_ERP_Servicos_Mobile>sencha app create Doran_ERP_Servicos_Mobile The message shows down: [ERROR] The current working directory (C:\Fontes\Ecolivery\Doran_ERP_Servicos_Mo bile) is not a valid SDK directory. Please 'cd' into a SDK directory before exec uting this command. Could you help us? Thanks!