update error message to explain more

src/mod/endpoints/mod_sofia/sofia.c

@@ -2491,7 +2491,9 @@ void *SWITCH_THREAD_FUNC sofia_profile_thread_run(switch_thread_t *thread, void
 							  TAG_END());	/* Last tag should always finish the sequence */
 	
 	if (!profile->nua) {
-		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Error Creating SIP UA for profile: %s\n", profile->name);
+		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Error Creating SIP UA for profile: %s\n"
+						  "The likely causes for this are:\n" "1) Another application is already listening on the specified address.\n"
+						  "2) The IP the profile is attempting to bind to is not local to this system.", profile->name);
 		sofia_profile_start_failure(profile, profile->name);
 		sofia_glue_del_profile(profile);
 		goto end;