That should work, are you sure you are starting a team game (CTF, TFFA)?
  A workaround is to:[list=1]
 Make a New Text Document and rename it bot_teams1.cfg or whatever, as long as it is a .cfg file and it is in your base folder
 Put this in the bot_teams1.cfg file: 
 set g_teamforcebalance 0
 set bot_minplayers 0 
 addbot luke 5 BLUE
 addbot kyle 5 BLUE
 addbot jedi 5 BLUE
 addbot jeditrainer 5 BLUE 
 addbot shadowtrooper 5 RED
 addbot newreborn 5 RED
 addbot rebornmaster 5 RED
 addbot cultist 5 RED
 addbot alora 5 RED 
 assuming you will be the 5th person on the blue team. Of course you can use different bots or a different number of bots as long as the total number of players is equal to or less than sv_maxclients. If the bots are "too good" set the skill level less than 5 (1-5).
 Start the game with no bots, just make sure that you have enough player slots (set them to "Human").
 In the console, enter /exec bot_teams1.cfg and the bots will be added
 [/list=1]  
 You can have multiple files like that specifying different numbers\combinations\skill levels of bots. 
 BTW, if you are going to play against bots, I strongly recommend downloading the DDS I-bots and DDS improved botroutes available here (
http://www.perkwerx.com/DDS/downloads.htm).