Swpm 1 sp 07 unattended Sap agent desintallation

HI experts,

we want to un install a SMD agent using swpm 1 Sp 7, while we start the  Sapinst

#<Installer_Media_Directory>/sapinst SAPINST_INPUT_PARAMETERS_URL=uninstallation.properties SAPINST_EXECUTE_PRODUCT_ID=NW_Uninstall:GENERIC.IND.PD SAPINST_SKIP_DIALOGS=true SAPINST_STOP_AFTER_DIALOG_PHASE=true

tthe error said, start sapinst without SAPINST_SKIP_DIALOGS=true parameter.

how  should we Run the Sapinst to used the un attended mode ?

thanks for your support.