issue on web connexion via kerberos ( I use Brower IE): Please help

this is the script :

web_set_user("TEC_FBI_TSTVIE_ASV", lr_decrypt("59cd14e9be1f9bc91f846e39834e8a8c8bca"), "sso.intra.bdf.local:443");
lr_start_transaction("CONNEXION_PORTAIL_FBI");
 web_browser("identity",
  DESCRIPTION,
  ACTION,
  "Navigate=https://idm.intra.bdf.local/identity/",
  LAST);

the is the message error :

Action.c(6): Notify: Transaction "CONNEXION_PORTAIL_FBI" started.
Action.c(7): Error -26353: web_browser cannot be used in a Virtual User of this type   [MsgId: MERR-26353]

please help me