[Users] Problem with timer and t_forward_nonack

Hello, I have a problem with my openser.cfg file, and especially with the way I should deal with the fr_inv_timer. I can't get it to work in my openser.cfgfile, and every time the timer ends I get the following error: 6(21521) ERROR:tm:t_forward_nonack: no branch for forwarding 6(21521) ERROR:tm:w_t_relay: t_forward_nonack failed The error occurs in a route bloc : route[1] { xlog("L_INFO", "INFO: route1 with r-URI $ru\n"); xlog("L_INFO", "test 14 : if(isflagset(2)) (line 200)\n"); if(isflagset(2)){ xlog("L_INFO", "-----> TRUE ,if the flag is set to 2, it calls t_on_failure\n"); t_on_failure("1"); t_relay(); exit; } xlog("L_INFO", "EXECUTION test 15 : if (!t_relay()) (ligne 206)\n"); if (!t_relay()) { xlog("L_INFO", "---------> TRUE\n"); sl_reply_error(); }; exit; } I have a log message at the beginning of failure_route[1] that shows that it is not entered before the error occurs. Could you tell me what's wrong ? Thank you very much, Antoine