Hostage problem in CS:S

Hi there. I`m making a hostage map in hammer, and when i`m having problems with hostage entity. I did all steps as said on tutorials. Placed hostage_entity, func_hostage_rescue, several info_node entites.OK i compiled map, opened console typed sv_cheats 1,then nav_generate and it returned me something like this:

"No valid walkable seed positions. Cannot generate Navigation Mesh."

I placed info_node as it was said. That the first node must see second and so on.

Because my map has doors, stairs and other 'difficult' things I thought what it may be problem with my map.
I started news map. Simply big cube then hollow it place info_player_counterterrorist, 3 hostages, hostage zone a few meters from hostages, and info_node, everything seems to be ok, but after compiling the error repeats.

Maybe someone could sent me a link to an uncompiled cs_ type map?
I would test it and chceck whether its something wrong with my cs/hl2 config.

thx in advance

ok heres what you do, just bot_add_t or ct and it will generate the nav file, this workaround works great I have found though you will need to go back possibly and manually put in some nav_mark_walkable points in the map while ingame. Try it and let me know but I had this same problem and I was able to fix it this way.

I had same problem on a map, the nav_generate just would'nt do it correctly. You have to show the game where the bots can go, do this like DB said, put nav_mark_walkable whereever the game did'nt put paths in. I also found the game can't figure out non-solid staircases, so you will have to manually make a custom nav file. Here is some excellent info on how to do this.

http://www.turtlerockstudios.com/forums/csbot/viewtopic.php?t=725

Hope this helps, it is actually very easy to do. Hint use bind keys for nav editing, makes it alot less work.