Apr 18 02:55:21 oren-ubuntu /usr/sbin/kamailio[26476]: WARNING: <core> [msg_translator.c:2499]: TCP/TLS connection (id: 0) for WebSocket could not be found (tcp:10.0.0.4:8080)

Apr 18 02:55:21 oren-ubuntu /usr/sbin/kamailio[26476]: ERROR: tm [t_msgbuilder.c:1367]: assemble_via: via building failed

Apr 18 02:55:21 oren-ubuntu /usr/sbin/kamailio[26476]: ERROR: tm [t_msgbuilder.c:1540]: build_uac_req(): Error while assembling Via

Apr 18 02:55:21 oren-ubuntu /usr/sbin/kamailio[26476]: ERROR: tm [uac.c:338]: t_uac: Error while building message

Apr 18 02:55:21 oren-ubuntu /usr/sbin/kamailio[26476]: ERROR: presence [notify.c:1591]: in function tmb.t_request_within

Apr 18 02:55:21 oren-ubuntu /usr/sbin/kamailio[26476]: ERROR: presence [notify.c:1678]: sending Notify not successful

Apr 18 02:55:21 oren-ubuntu /usr/sbin/kamailio[26476]: ERROR: presence [subscribe.c:678]: Could not send notify

Apr 18 02:55:21 oren-ubuntu /usr/sbin/kamailio[26476]: ERROR: presence [subscribe.c:713]: occured

Apr 18 02:55:21 oren-ubuntu /usr/sbin/kamailio[26476]: ERROR: presence [subscribe.c:994]: in update_subscription

Could anyone help here ?

I think it is only some configuration problem, but i'm not sure how to solve it.